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Spring (/sprɪŋ/ spring) is one of the four temperate seasons, the transition time between winter and summer. Spring and "springtime" refer to the season, and also to ideas of rebirth, renewal and regrowth. The specific definition of the exact timing of "spring" varies according to local climate, cultures and customs. At the spring equinox, days are close to 12 hours long with day length increasing as the season progresses.
Meteorologists generally define four seasons in many climatic areas: spring, summer, autumn (or 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.(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.
In the USA and some other regions in the Northern Hemisphere, the astronomical March equinox (currently around 21 March) is often taken to mark the first day of spring, and the Northern solstice is sometimes taken as the first day of summer (usually 21 June in the Northern Hemisphere). In another US tradition, 2 February, Candlemas, can be regarded as the start of spring if it is mild (see Groundhog Day). In South Africa, Australia, and New Zealand, spring begins on 1 September, and has no relation to the vernal equinox. In Ireland spring traditionally starts on 1 February, St Brigid's Day,[3] although Irish meteorologists consider the whole of February to be part of winter.
In South America, the Tupi-Guarani calendar, from the former inhabitants of what is presently Brazil, Northern Argentina and Paraguay, counted 365 days, plus a fourth part of a day, needing no extra day every four years. The beginning of the solar year was marked by the rising of the M25 Constellation in the horizon, which occurs between June 5 and June 11 in this part of the world. For these native people, the four seasons were clearly identified by the solstices and equinoxes[citation needed]. The trajectory of the Sun throughout the year was divided into "The New Age" (Ara Pyau) and "The Old Age" (Ara Ymă). Ara Pyau was spring and summer, and Ara Ymă was autumn and winter. This calendar, which had no graphed or written form, marked activities such as hunting, fishing, planting, harvesting and religious rituals.
In East Asian 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 Imbolc or Candlemas) and continues until early May (Beltane).
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.
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 flora to flourish. It therefore varies according to the climate and according to the specific weather of a particular year.