Spring, also known as springtime, is one of the four

temperate In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ran ...

season A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's axial tilt, tilted orbit around the Sun. In temperat ...

s, succeeding

winter Winter is the coldest and darkest season of the year in temperate and polar climates. It occurs after autumn and before spring. The tilt of Earth's axis causes seasons; winter occurs when a hemisphere is oriented away from the Sun. Dif ...

and preceding

summer Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are the longest and darkness hours are the shortest, with day ...

. There are various technical definitions of spring, but local usage of the term varies according to local climate, cultures and customs. When it is spring in the

Northern Hemisphere The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar ...

, it is

autumn Autumn, also known as fall (especially in US & Canada), is one of the four temperate seasons on Earth. Outside the tropics, autumn marks the transition from summer to winter, in September (Northern Hemisphere) or March ( Southern Hemisphe ...

in the Southern Hemisphere and vice versa. At the spring

equinox A solar equinox is a moment in time when the Sun appears directly above the equator, rather than to its north or south. On the day of the equinox, the Sun appears to rise directly east and set directly west. This occurs twice each year, arou ...

, also called the vernal equinox,

days A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, afternoon, evening, and night. This daily cyc ...

and nights are approximately twelve hours long, with daytime length increasing and nighttime length decreasing as the season progresses until the summer

solstice A solstice is the time when the Sun reaches its most northerly or southerly sun path, excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and 20–22 December. In many countries ...

. The spring equinox is in March in the Northern Hemisphere and in September in the Southern Hemisphere, while the summer solstice is in June in the Northern Hemisphere and in December in the Southern Hemisphere. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth.

Subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones immediately to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Ge ...

and

tropical The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

areas have climates better described in terms of other seasons, e.g. dry or wet, monsoonal or cyclonic. Cultures may have local names for seasons which have little equivalence to the terms originating in Europe.

Etymology

According to the ''Online Etymological Dictionary'', "spring" in the sense of the season comes from phrases such as "springing time" (14th century) and "the spring of the year". This use is from an archaic noun meaning "act or time of springing or appearing; the first appearance; the beginning, birth, rise, or origin". Spring as a word in general appeared via the

Middle English Middle English (abbreviated to ME) is a form of the English language that was spoken after the Norman Conquest of 1066, until the late 15th century. The English language underwent distinct variations and developments following the Old English pe ...

''springen'', via the

Old English Old English ( or , or ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the Early Middle Ages. It developed from the languages brought to Great Britain by Anglo-S ...

''springan''. These were verbs meaning to rise up or to burst forth, (see also the modern German ''springen'' 'jump') and are not believed to have originally related to the season. These all originate from

Proto-Germanic Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the linguistic reconstruction, reconstructed proto-language of the Germanic languages, Germanic branch of the Indo-European languages. Proto-Germanic eventually developed from ...

*sprenganan.

Meteorological reckoning

Meteorologist A meteorologist is a scientist who studies and works in the field of meteorology aiming to understand or predict Earth's atmosphere of Earth, atmospheric phenomena including the weather. Those who study meteorological phenomena are meteorologists ...

s generally define four seasons in many climatic areas: spring, summer, autumn (fall), and winter. These are determined by the values of their average temperatures on a monthly basis, with each season lasting three calendar months. The three warmest months are by definition

, the three coldest months are

, and the intervening gaps are spring and

. Meteorological spring can therefore, start on different dates in different regions. In the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

and

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

, spring months are March, April, and May. In

Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...

, following the Irish calendar, spring is often defined as February, March, and April. In

Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...

, meteorologists define the beginning of spring as the first occasion on which the average 24 hours temperature exceeds zero degrees Celsius for seven consecutive days, thus the date varies with latitude and elevation (but no earlier than 15 February, and no later than 31 July). In

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...

and

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

the spring months are September, October, and November.

Astronomical and solar reckoning

In the Northern Hemisphere (with countries such as Germany, the United States, Canada, and the UK), solar reckoning was traditionally used with the solstices and equinoxes representing the midpoints of each season, however, the astronomical vernal equinox (varying between 19 and 21 March) can be taken to mark the first day of spring with the

summer solstice The summer solstice or estival solstice occurs when one of Earth's poles has its maximum tilt toward the Sun. It happens twice yearly, once in each hemisphere ( Northern and Southern). The summer solstice is the day with the longest peri ...

(around 21 June) marked as first day of summer. By solar reckoning, Spring is held to begin 1 February until the first day of Summer on

May Day May Day is a European festival of ancient origins marking the beginning of summer, usually celebrated on 1 May, around halfway between the Northern Hemisphere's March equinox, spring equinox and midsummer June solstice, solstice. Festivities ma ...

, with the summer and winter solstices being marked as

Midsummer Midsummer is a celebration of the season of summer, taking place on or near the date of the summer solstice in the Northern Hemisphere; the longest Daytime, day of the year. The name "midsummer" mainly refers to summer solstice festivals of Eu ...

and

Midwinter Midwinter is the middle of the winter. The term is attested in the early Germanic calendars where it was a period or a day which may have been determined by a lunisolar calendar before it was adapted into the Gregorian calendar. It appears with s ...

respectively, instead of as the beginning of the season as is the case with astronomical reckoning. In Persian culture the first day of spring is the first day of the first month (called Farvardin) which begins on 20 or 21 March. In the traditional Chinese calendar, the "spring" season () consists of the days between Lichun (3–5 February), taking Chunfen (20–22 March) as its midpoint, then ending at Lixia (5–7 May). Similarly, according to the Celtic tradition, which is based solely on daylight and the strength of the noon sun, spring begins in early February (near

Imbolc Imbolc or Imbolg (), also called Saint Brigid's Day (; ; ), is a Gaels, Gaelic traditional festival on 1 February. It marks the beginning of Spring (season), spring, and in Christianity, it is the calendar of saints, feast day of Brigid of Kild ...

Candlemas Candlemas, also known as the Feast of the Presentation of Jesus Christ, the Feast of the Purification of the Blessed Virgin Mary, or the Feast of the Holy Encounter, is a Christian holiday, Christian feast day commemorating the presentation of ...

) and continues until early May (

Beltane Beltane () or ''Bealtaine'' () is the Gaels, Gaelic May Day festival, marking the beginning of summer. It is traditionally held on 1 May, or about midway between the March equinox, spring equinox and summer solstice. Historically, it was widely ...

), with

Saint Patrick's Day Saint Patrick's Day, or the Feast of Saint Patrick (), is a religious and cultural holiday held on 17 March, the traditional death date of Saint Patrick (), the foremost patron saint of Ireland. Saint Patrick's Day was made an official Chris ...

(17 March) being regarded as the middle day of spring. Late

Roman Republic The Roman Republic ( ) was the era of Ancient Rome, classical Roman civilisation beginning with Overthrow of the Roman monarchy, the overthrow of the Roman Kingdom (traditionally dated to 509 BC) and ending in 27 BC with the establis ...

scholar

Marcus Terentius Varro Marcus Terentius Varro (116–27 BCE) was a Roman polymath and a prolific author. He is regarded as ancient Rome's greatest scholar, and was described by Petrarch as "the third great light of Rome" (after Virgil and Cicero). He is sometimes call ...

defined spring as lasting from the seventh day before the Ides of

Februarius ''Februarius'', fully ''Mensis Februarius'' ("month of Februa"), was the shortest month of the Roman calendar from which the Julian calendar, Julian and Gregorian calendar, Gregorian month of February derived. It was eventually placed second in ...

(7 February) to the eighth day before the Ides of

Maius ''Maius'' or ''mensis Maius'' (May) was the fifth month of the ancient Roman calendar in the classical period, following '' Aprilis'' (April) and preceding '' Iunius'' (June). On the oldest Roman calendar that had begun with March, it was the third ...

(8 May). The spring season in

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

is culturally in the months of March and April, with an average temperature of approx 32 °C. Some people in India especially from Karnataka state celebrate their new year in spring,

Ugadi () or (), also known as Samvatsarādi (), is the first day of the year on the Hindu calendar that is traditionally celebrated by the Telugu people and the Kannadigas in the Indian states of Andhra Pradesh, Telangana, Karnataka, Tamil Na ...

Ecological reckoning

The beginning of spring is not always determined by fixed calendar dates. The phenological or ecological definition of spring relates to biological indicators, such as the blossoming of a range of plant species, the activities of animals, and the special smell of soil that has reached the temperature for micro

flora Flora (: floras or florae) is all the plant life present in a particular region or time, generally the naturally occurring (indigenous (ecology), indigenous) native plant, native plants. The corresponding term for animals is ''fauna'', and for f ...

to flourish. These indicators, along with the beginning of spring, vary according to the local

climate Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteoro ...

and according to the specific

weather Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloud cover, cloudy. On Earth, most weather phenomena occur in the lowest layer of the planet's atmo ...

of a particular year. In England, Wales and Northern Ireland, the

National Trust The National Trust () is a heritage and nature conservation charity and membership organisation in England, Wales and Northern Ireland. The Trust was founded in 1895 by Octavia Hill, Sir Robert Hunter and Hardwicke Rawnsley to "promote the ...

runs the # BlossomWatch campaign, which encourages people to share images of blossom with one another, as an early indicator of the arrival of the season. Some ecologists divide the year into six seasons. In addition to spring, ecological reckoning identifies an earlier separate prevernal (early or pre-spring) season between the hibernal (winter) and vernal (spring) seasons. This is a time when only the hardiest flowers like the crocus are in bloom, sometimes while there is still some snowcover on the ground.

Natural events

1950- Springtime average temperature changes - US contiguous 48

During early spring, the axis of the

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

is increasing its tilt relative to the Sun, and the length of daylight rapidly increases for the relevant hemisphere. The hemisphere begins to warm significantly, causing new plant growth to "spring forth", giving the season its name. Any

snow Snow consists of individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water througho ...

begins to melt, swelling streams with runoff and any frosts become less severe. In climates that have no snow, and rare frosts, air and ground temperatures increase more rapidly. Many flowering plants bloom at this time of year, in a long succession, sometimes beginning when snow is still on the ground and continuing into early summer. In normally snowless areas, "spring" may begin as early as February (Northern Hemisphere) or August (Southern Hemisphere), heralded by the blooming of deciduous magnolias, cherries, and quince. Many temperate areas have a dry spring, and wet autumn (fall), which brings about flowering in this season, more consistent with the need for water, as well as warmth.

Subarctic The subarctic zone is a region in the Northern Hemisphere immediately south of the true Arctic, north of hemiboreal regions and covering much of Alaska, Canada, Iceland, the north of Fennoscandia, Northwestern Russia, Siberia, and the Cair ...

areas may not experience "spring" at all until May. While spring is a result of the warmth caused by the changing orientation of the Earth's axis relative to the Sun, the weather in many parts of the world is affected by other, less predictable events. The rainfall in spring (or any season) follows trends more related to longer cycles—such as the

solar cycle The Solar cycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a periodic 11-year change in the Sun's activity measured in terms of Modern Maximum, variations in the number of observed sunspots on the Sun ...

—or events created by ocean currents and ocean temperatures—for example, the

El Niño EL, El or el may refer to: Arts and entertainment Fictional entities * El, a character from the manga series ''Shugo Chara!'' by Peach-Pit * Eleven (''Stranger Things'') (El), a fictional character in the TV series ''Stranger Things'' * El, fami ...

effect and the Southern Oscillation Index. Unstable spring weather may occur more often when warm air begins to invade from lower

latitude In geography, latitude is a geographic coordinate system, geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at t ...

s, while cold air is still pushing from the Polar regions. Flooding is also most common in and near mountainous areas during this time of year, because of snow-melt which is accelerated by warm rains. In North America,

Tornado Alley Tornado Alley, also known as Tornado Valley, is a loosely defined location of the central United States and, in the 21st century, Canada where tornadoes are most frequent. The term was first used in 1952 as the title of a research project to st ...

is most active at this time of year, especially since the

Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...

prevent the surging hot and cold air masses from spreading eastward, and instead force them into direct conflict. Besides

tornado A tornado is a violently rotating column of air that is in contact with the surface of Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. It is often referred to as a twister, whirlwind or cyclone, although the ...

es, supercell thunderstorms can also produce dangerously large

hail Hail is a form of solid Precipitation (meteorology), precipitation. It is distinct from ice pellets (American English "sleet"), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailsto ...

and very high winds, for which a severe thunderstorm warning or tornado warning is usually issued. Even more so than in winter, the

jet stream Jet streams are fast flowing, narrow thermal wind, air currents in the Earth's Atmosphere of Earth, atmosphere. The main jet streams are located near the altitude of the tropopause and are westerly winds, flowing west to east around the gl ...

s play an important role in unstable and severe Northern Hemisphere weather in springtime. In recent decades, season creep has been observed, which means that many phenological signs of spring are occurring earlier in many regions by around two days per decade. Spring in the Southern Hemisphere is different in several significant ways to that of the Northern Hemisphere for several reasons, including: #There is no land bridge between Southern Hemisphere countries and the

Antarctic The Antarctic (, ; commonly ) is the polar regions of Earth, polar region of Earth that surrounds the South Pole, lying within the Antarctic Circle. It is antipodes, diametrically opposite of the Arctic region around the North Pole. The Antar ...

zone capable of bringing in cold air without the temperature-mitigating effects of extensive tracts of water; #The vastly greater amount of ocean in the Southern Hemisphere at most latitudes; #There is a circumpolar flow of air ('' the roaring 40s and 50s'') uninterrupted by large land masses; #No equivalent jet streams; and #The peculiarities of the reversing ocean currents in the Pacific.

Cultural associations

Carnival

Carnival is practiced by many

Christians A Christian () is a person who follows or adheres to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. Christians form the largest religious community in the world. The words '' Christ'' and ''C ...

around the world in the days before

Lent Lent (, 'Fortieth') is the solemn Christianity, Christian religious moveable feast#Lent, observance in the liturgical year in preparation for Easter. It echoes the 40 days Jesus spent fasting in the desert and enduring Temptation of Christ, t ...

(40 days, without Sundays, before Easter). It is the first spring festival of the new year for many.

Easter

Easter is the most important religious feast in the Christian

liturgical year The liturgical year, also called the church year, Christian year, ecclesiastical calendar, or kalendar, consists of the cycle of liturgical days and seasons that determines when feast days, including celebrations of saints, are to be obse ...

. Christians believe that

Jesus Jesus (AD 30 or 33), also referred to as Jesus Christ, Jesus of Nazareth, and many Names and titles of Jesus in the New Testament, other names and titles, was a 1st-century Jewish preacher and religious leader. He is the Jesus in Chris ...

was resurrected from the dead on the "third day"This resurrection is commonly said to have occurred "on the third day after resting for the Sabbath (Friday sundown to Saturday sundown), including the day of crucifixion." (e.g. Luke 24:21 KJV) (two days ''after'' his

crucifixion Crucifixion is a method of capital punishment in which the condemned is tied or nailed to a large wooden cross, beam or stake and left to hang until eventual death. It was used as a punishment by the Achaemenid Empire, Persians, Ancient Carthag ...

), and celebrate this resurrection on Easter Day, two days after

Good Friday Good Friday, also known as Holy Friday, Great Friday, Great and Holy Friday, or Friday of the Passion of the Lord, is a solemn Christian holy day commemorating the crucifixion of Jesus and his death at Calvary (Golgotha). It is observed during ...

. Since the

Last Supper Image:The Last Supper - Leonardo Da Vinci - High Resolution 32x16.jpg, 400px, alt=''The Last Supper'' by Leonardo da Vinci - Clickable Image, ''The Last Supper (Leonardo), The Last Supper'' (1495-1498). Mural, tempera on gesso, pitch and mastic ...

was a Passover Seder, the date of Easter can be calculated as the first Sunday after the start of Passover. This is usually (see

Passover Passover, also called Pesach (; ), is a major Jewish holidays, Jewish holiday and one of the Three Pilgrimage Festivals. It celebrates the Exodus of the Israelites from slavery in Biblical Egypt, Egypt. According to the Book of Exodus, God in ...

below) the first Sunday after the first full moon following the spring equinox. The date of

Easter Easter, also called Pascha ( Aramaic: פַּסְחָא , ''paskha''; Greek: πάσχα, ''páskha'') or Resurrection Sunday, is a Christian festival and cultural holiday commemorating the resurrection of Jesus from the dead, described in t ...

varies between 22 March and 25 April (which corresponds to between 4 April and 8 May in the

Gregorian Calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...

for the Eastern and

Oriental Orthodox The Oriental Orthodox Churches are Eastern Christianity, Eastern Christian churches adhering to Miaphysitism, Miaphysite Christology, with approximately 50 million members worldwide. The Oriental Orthodox Churches adhere to the Nicene Christian ...

Churches using the

Julian Calendar The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts ...

). In this celebration, the children do an easter egg hunt.

May Day

The First of May is the date of many

public holiday A public holiday, national holiday, federal holiday, statutory holiday, bank holiday or legal holiday is a holiday generally established by law and is usually a non-working day during the year. Types Civic holiday A ''civic holiday'', also k ...

s. In many countries, May Day is synonymous with

International Workers' Day International Workers' Day, also called Labour Day in some countries and often referred to as May Day, is a celebration of Wage labour, labourers and the working classes that is promoted by the international labour movement and occurs every yea ...

, or

Labour Day Labour Day is an annual day of celebration of the labour movement and its labor rights, achievements. It has its origins in the trade union, labour union movement, specifically the Eight-hour day movement, eight-hour day movement, which advoca ...

, which celebrates the social and economic achievements of the

labour movement The labour movement is the collective organisation of working people to further their shared political and economic interests. It consists of the trade union or labour union movement, as well as political parties of labour. It can be considere ...

. As a day of celebration, the holiday has ancient origins, and it can relate to many customs that have survived into modern times. Many of these customs are due to May Day being a cross-quarter day, meaning that (in the

where it is almost exclusively celebrated) it falls approximately halfway between the spring equinox and

. In the Celtic tradition, this date marked the end of spring and the beginning of summer.

Passover

The Passover begins on the 15th day of the month of

Nisan Nisan (or Nissan; from ) in the Babylonian and Hebrew calendars is the month of the barley ripening and first month of spring. The name of the month is an Akkadian language borrowing, although it ultimately originates in Sumerian ''nisag' ...

, which typically falls in March or April of the

Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...

on the night of a full moon after the northern spring equinox. However, due to leap months falling after the vernal equinox, Passover sometimes starts on the second full moon after vernal equinox, as in 2016. Jewish people celebrate this holiday to commemorate their escape from slavery in

Egypt Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...

as described in the book of Exodus in the

Torah The Torah ( , "Instruction", "Teaching" or "Law") is the compilation of the first five books of the Hebrew Bible, namely the books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy. The Torah is also known as the Pentateuch () ...

. Foods consumed during Passover seders, such as lamb and barley, are tied to springtime seasonal availability. In this celebration, children recite the Four Questions during the seder and hunt for the afikoman afterwards.

Allhallowtide

The Western Christian season encompassing the triduum of All Saints' Eve (

Halloween Halloween, or Hallowe'en (less commonly known as Allhalloween, All Hallows' Eve, or All Saints' Eve), is a celebration geography of Halloween, observed in many countries on 31 October, the eve of the Western Christianity, Western Christian f ...

All Saints' Day All Saints' Day, also known as All Hallows' Day, the Feast of All Saints, the Feast of All Hallows, the Solemnity of All Saints, and Hallowmas, is a Christian solemnity celebrated in honour of all the saints of the Church, whether they are know ...

(All Hallows') and All Souls' Day are observed in the spring in the Southern hemisphere.

Notes

References

External links

Word LoreOnline Etymology DictionaryGlossary of Meteorology
(archived 15 March 2012) * (archived 7 July 2011)
Earth's Seasons, Equinoxes, Solstices, Perihelion, and Aphelion, 2000–2020
(from the

United States Naval Observatory The United States Naval Observatory (USNO) is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense. Established in 1830 as the ...

's Astronomical Applications Department) (archived 13 October 2007) * (from )
What day does spring start?
(BBC, UK News Magazine)
Status of Spring
– Maps of Spring Leaf and Bloom Indices for the United States * {{DEFAULTSORT:Spring (Season)