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'''Spring''' is one of the four [http://en.wikipedia.org/wiki/Temperateness temperate] [[seasons]], the [[transition]] period between [[winter]] and [[summer]]. Spring and "springtime" refer to the season, and broadly to [[ideas]] of rebirth, [[renewal]] and regrowth. The specific definition of "spring" as a season differs, however, among [[scientific]] [[disciplines]] such as [[astronomy]] and meteorology, and in [[cultural]] and [[human]] terms. The exact definitions are explored below.
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'''Spring''' is one of the four [https://en.wikipedia.org/wiki/Temperateness temperate] [[seasons]], the [[transition]] period between [[winter]] and [[summer]]. Spring and "springtime" refer to the season, and broadly to [[ideas]] of rebirth, [[renewal]] and regrowth. The specific definition of "spring" as a season differs, however, among [[scientific]] [[disciplines]] such as [[astronomy]] and meteorology, and in [[cultural]] and [[human]] terms. The exact definitions are explored below.
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As it refers to [http://en.wikipedia.org/wiki/Climate climate] and the [[Earth]]'s tilt [[relative]] to the [[sun]], spring days are close to 12 hours long with day length increasing as the season [[progresses]].
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As it refers to [https://en.wikipedia.org/wiki/Climate climate] and the [[Earth]]'s tilt [[relative]] to the [[sun]], spring days are close to 12 hours long with day length increasing as the season [[progresses]].
    
Meteorologists generally define four seasons in many climatic areas, [[winter]], spring, [[summer]] and [[autumn]] (or fall). These are demarcated by the [[values]] of their average temperatures on a monthly basis, with each season lasting three months. The three warmest months are by definition [[summer]], the three coldest months are [[winter]], and the intervening gaps are spring and [[autumn]]. Spring, when defined in this [[manner]], can start on [[different]] dates in different regions. In terms of complete months, in most North Temperate Zone locations, spring months are March, April and May (Summer is June, July, August; autumn is September, October, November; winter is December, January, February). The vast majority of South Temperate Zone locations will have opposing seasons with spring in September, October and November.
 
Meteorologists generally define four seasons in many climatic areas, [[winter]], spring, [[summer]] and [[autumn]] (or fall). These are demarcated by the [[values]] of their average temperatures on a monthly basis, with each season lasting three months. The three warmest months are by definition [[summer]], the three coldest months are [[winter]], and the intervening gaps are spring and [[autumn]]. Spring, when defined in this [[manner]], can start on [[different]] dates in different regions. In terms of complete months, in most North Temperate Zone locations, spring months are March, April and May (Summer is June, July, August; autumn is September, October, November; winter is December, January, February). The vast majority of South Temperate Zone locations will have opposing seasons with spring in September, October and November.
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[[Astronomy|Astronomically]], the [http://en.wikipedia.org/wiki/Equinox vernal equinox] (usually 20 March in the Northern Hemisphere, and 22 September in the Southern Hemisphere), should be the middle of spring (based on the [[angle]] of the [[sun]] and [http://en.wikipedia.org/wiki/Insolation insolation]) and the [http://en.wikipedia.org/wiki/Solstice summer solstice] (usually 21 June in the Northern Hemisphere and 21 December in the Southern Hemisphere) should be the middle of summer (because the [[sun]] is at its highest), but daytime temperatures lag behind insolation by several weeks because the [[earth]] and sea have thermal latency and take time to warm up.
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[[Astronomy|Astronomically]], the [https://en.wikipedia.org/wiki/Equinox vernal equinox] (usually 20 March in the Northern Hemisphere, and 22 September in the Southern Hemisphere), should be the middle of spring (based on the [[angle]] of the [[sun]] and [https://en.wikipedia.org/wiki/Insolation insolation]) and the [https://en.wikipedia.org/wiki/Solstice summer solstice] (usually 21 June in the Northern Hemisphere and 21 December in the Southern Hemisphere) should be the middle of summer (because the [[sun]] is at its highest), but daytime temperatures lag behind insolation by several weeks because the [[earth]] and sea have thermal latency and take time to warm up.
    
Some [[cultures]], such as those that devised the [[Celtic]] and East Asian calendars, call the spring equinox "mid-spring", but others (especially in the USA and sometimes in England) regard it as the "first day of spring". For most temperate regions, signs of spring appear long before the middle of March, but the folklore of 21 March being the "first day of spring" persists, and 21 June as the "first day of summer" is common in the USA. In South Africa, Australia and New Zealand, spring begins on 1 September, and has no relation to the vernal equinox.
 
Some [[cultures]], such as those that devised the [[Celtic]] and East Asian calendars, call the spring equinox "mid-spring", but others (especially in the USA and sometimes in England) regard it as the "first day of spring". For most temperate regions, signs of spring appear long before the middle of March, but the folklore of 21 March being the "first day of spring" persists, and 21 June as the "first day of summer" is common in the USA. In South Africa, Australia and New Zealand, spring begins on 1 September, and has no relation to the vernal equinox.
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In East Asian [http://en.wikipedia.org/wiki/Solar_term Solar term], spring begins on 4 February and ends on 5 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 [http://en.wikipedia.org/wiki/Imbolc Imbolc] or [http://en.wikipedia.org/wiki/Candlemas Candlemas]) and continues until early May ([http://en.wikipedia.org/wiki/Beltane Beltane]).
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In East Asian [https://en.wikipedia.org/wiki/Solar_term Solar term], spring begins on 4 February and ends on 5 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 [https://en.wikipedia.org/wiki/Imbolc Imbolc] or [https://en.wikipedia.org/wiki/Candlemas Candlemas]) and continues until early May ([https://en.wikipedia.org/wiki/Beltane Beltane]).
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The phenological definition of spring relates to indicators, the blossoming of a range of plant [[species]], and the [[activities]] of [[animals]], or the special smell of soil that has reached the temperature for micro [http://en.wikipedia.org/wiki/Flora flora] to flourish. It therefore varies according to the [http://en.wikipedia.org/wiki/Climate climate] and according to the specific [[weather]] of a particular year.[http://en.wikipedia.org/wiki/Spring_%28season%29]
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The phenological definition of spring relates to indicators, the blossoming of a range of plant [[species]], and the [[activities]] of [[animals]], or the special smell of soil that has reached the temperature for micro [https://en.wikipedia.org/wiki/Flora flora] to flourish. It therefore varies according to the [https://en.wikipedia.org/wiki/Climate climate] and according to the specific [[weather]] of a particular year.[https://en.wikipedia.org/wiki/Spring_%28season%29]
    
[[Category: General Reference]]
 
[[Category: General Reference]]

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