Four Seasons

Four Seasons

The seasons are popularly considered in some Western countries to start at the equinoxes and solstices, based on astronomical reckoning. Thus, in the Southern Hemisphere, based on astronomy, summer begins on the day of the December solstice and ends on the March equinox. When it is summer in the southern hemisphere it is winter in the northern hemisphere, and vice versa. But, because the seasonal lag is less than 1/10th of a year (except near large bodies of water), the meteorological start of the season, which is based on average temperature patterns, precedes by about three weeks the start of the astronomical season.^[1] According to meteorologists, summer extends for the whole months of December, January and February in the southern hemisphere, and the whole months of June, July and August in the northern hemisphere. This meteorological definition of summer also aligns with the commonly viewed notion of summer as the season with the longest (and warmest) days of the year, in which daylight predominates. From the astronomical perspective, spring days lengthen from equinox to solstice and summer days shorten from solstice to equinox, while meteorological summer encompasses the build-up to the longest day and a diminishing thereafter, so that summer has many more hours of daylight than spring.

Summer generally refers to the warmest and humid season between spring and autumn, from the summer solstice to the autumnal equinox. In the Northern Hemisphere, this falls from the June solstice to the September equinox, while in the Southern Hemisphere it falls from the December solstice to the March equinox. Scientifically, the effect and rate of summer heat is a complex matter and always varies depending on the location and axis of earth. Similarly, summer marks the warmest time of year with the longest days.

Spring is one of the two temperate seasons. Spring marks the transition from winter into summer.

spring

According to the astronomical definition, spring begins on the Vernal Equinox (usually March 20 in the Northern Hemisphere, and September 21 in the Southern Hemisphere), and lasts until the summer solstice (usually June 22 in the Northern Hemisphere and December 22 in the Southern Hemisphere). According to this definition, therefore, the day called Midsummer's Day in some traditions is the first day of Summer. Meteorologists generally define the beginning of spring as March 1 in the Northern Hemisphere and September 1 in the Southern Hemisphere. 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). Unlike the other three seasons, people in relatively cool climates are likely to use the astronomical definition for the beginning of spring in popular jargon but retain the meterological definition for the other three seasonal turning points.

The phenological definition of spring relates to vindicators, 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. The first swallow to arrive or the flowering of lilac may be the indicator of spring. It therefore varies according to the climate and according to the specific weather of a particular year.

Autumn (also known as fall in North American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in late September (northern hemisphere) or late March (southern hemisphere) when the arrival of night becomes noticeably earlier

Winter is one of the four seasons of temperate zones. Calculated astronomically, it begins on the solstice and ends on the equinox. It is the season with the shortest days and the lowest average temperatures. It has colder weather and, especially in the higher latitudes or altitudes, snow and ice. The coldest average temperatures of the season are typically experienced in January in the Northern Hemisphere and in July in the Southern Hemisphere