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Spring (season)
Spring is one of the four conventional temperate seasons, following winter and preceding summer. 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, it will be autumn in the Southern Hemisphere. At the spring equinox, days are approximately 12 hours long with day length increasing as the season progresses. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth. Subtropical and tropical areas have climates better described in terms of other seasons, e.g. dry or wet, monsoonal or cyclonic. Often, cultures have locally defined names for seasons which have little equivalence to the terms originating in Europe.
==Meteorological reckoning==
Meteorologists generally define four seasons in many climatic areas: spring, summer, autumn (fall) and winter. 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, although differences exist from country to country.〔(【引用サイトリンク】title=Spring )〕 (Summer is June, July, August; autumn is September, October, November; winter is December, January, February). Most south temperate zone locations have opposing seasons with spring in September, October and November. Swedish meteorologists define the beginning of spring as the first occasion on which the average daytime temperature exceeds zero degrees Celsius for seven consecutive days, thus the date varies with latitude and elevation.
In Australia and New Zealand, spring conventionally begins on 1 September and ends 30 November.〔(【引用サイトリンク】title=Do you want the dates of our seasons changed? )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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