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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 to flourish. These indicators, along with the beginning of spring, vary according to the local climate and according to the specific weather of a particular year. Some ecologists divide the year into six seasons. [6] 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. [7]

During early spring, the axis of the Earth 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. [8]

Any snow 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. [9] 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. [10] 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 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—or events created by ocean currents and ocean temperatures—for example, the El Niño effect and the Southern Oscillation Index.

Unstable spring weather may occur more often when warm air begins to invade from lower latitudes, 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 is most active at this time of year, especially since the Rocky Mountains prevent the surging hot and cold air masses from spreading eastward, and instead force them into direct conflict. Besides tornadoes, supercell thunderstorms can also produce dangerously large hail and very high winds, for which a severe thunderstorm warning or tornado warning is usually issued. Even more so than in winter, the jet streams play an important role in unstable and severe Northern Hemisphere weather in springtime. [11]

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. [citation needed]

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 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;
At this time in Earth's geologic history the Earth has an orbit which brings it in closer to the Southern Hemisphere for its warmer seasons;
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. [12]

Easter is the most important religious feast in the Christian liturgical year. [14] Christians believe that Jesus was resurrected from the dead on the "third day"[15] (two days after his crucifixion), and celebrate this resurrection on Easter Day, two days after Good Friday. The date of Easter varies between 22 March and 25 April (which corresponds to between 4 April and 8 May in the Gregorian Calendar for the Eastern and Oriental Orthodox Churches using the Julian Calendar). In the Southern Hemisphere Easter occurs during autumn.

1 May is the date of many public holidays. [16] In many countries, May Day is synonymous with International Workers' Day, or Labour Day, which celebrates the social and economic achievements of the labour movement. 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 Northern Hemisphere where it is almost exclusively celebrated) it falls approximately halfway between the spring equinox and summer solstice. In the Celtic tradition, this date marked the end of spring and the beginning of summer.

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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 to flourish. These indicators, along with the beginning of spring, vary according to the local climate and according to the specific weather of a particular year. Some ecologists divide the year into six seasons. [6] 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. [7]

 

The beginning of spring is not always determined by fixed calendar dates. The phenological or ecological definition of spring refers to biological indicators, such as the flowering of a number of plant species, animal activities and the special smell of soil that has reached the temperature for the microflora to flourish . These indicators, along with the beginning of spring, vary depending on the local climate and the specific climate of a particular year. Some environmentalists divide the year into six seasons. [6] In addition to spring, ecological calculation identifies an earlier foreautumn (early or pre-spring) season between hibernation (winter) and vernal (spring) seasons. This is a time when only the most resilient flowers like saffron are in bloom, sometimes while there is still some snow cover on the ground. [7]

During early spring, the Earth's axis is increasing its inclination relative to the Sun, and the length of daylight increases rapidly for the relevant hemisphere. The hemisphere begins to heat up significantly, causing the growth of new plants to "come out", giving the season its name. [8]

Any snow begins to melt, swelling is transmitted with run-off, and frost becomes less severe. In snow-free and rare frost climates, air and soil temperatures rise faster.

Many flowering plants bloom at this time of year, in a long succession, sometimes starting when snow is still on the ground and continuing in early summer. [9] In areas normally without snow, "spring" can begin as early as February (northern hemisphere) or August (southern hemisphere), announced by the flowering of deciduous magnolias, cherries and quince. [10] Many temperate areas have a dry spring, and wet autumn (autumn), which produces flowering this season, more consistent with the need for water as well as heat. Subarctic areas may not experience "spring" at all until May.

While spring is the result of heat caused by the change in orientation of the Earth's axis relative to the Sun, the climate in many parts of the world is affected by other less predictable events. Rain in spring (or any season) follows more trends related to longer cycles, such as solar cycle, or events created by ocean currents and ocean temperatures, such as the El Niño effect and the southern oscillation rate.

Unstable spring weather can occur more often when hot air begins to invade from lower latitudes, while cold air is still pushing from the polar regions. Flooding is also more common in mountainous and nearby areas during this time of year, due to snow speeding up by warm rains. In North America, Tornado Alley is more active at this time of year, especially as the Rocky Mountains prevent hot and cold air masses from splashing eastwards, and instead force them into direct conflict. In addition to tornadoes, supercell storms can also produce dangerously large hail and very strong winds, usually emitting a severe storm warning or tornado warning. Even more so than in winter, jet streams play an important role in the unstable and severe climate of the northern hemisphere in spring. [11]

In recent decades, the season's chill has been observed, meaning that many phenological signs of spring are occurring earlier in many regions for about two days a decade. Awards and recognitions[edit]

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 the countries of the southern hemisphere and the Antarctic area capable of bringing cold air without the effects that mitigate the temperature of large expanses of water;
The much higher amount of ocean in the southern hemisphere in most latitudes;
At this time in Earth's geological history, Earth has an orbit that brings it closer to the southern hemisphere for its warmest seasons;
There is a circumpolar flow of air (the roaring 40s and 50s) uninterrupted by large land masses;
No jet streams are equivalent; And
The peculiarities of ocean currents inverting in the Pacific. [12]

Easter is the most important religious holiday of the Christian liturgical year. [14] Christians believe that Jesus rose from the dead on the "third day"[15] (two days after his crucifixion), and celebrate this resurrection on Easter Day, two days laterGood Friday. The date of Easter varies between March 22 and April 25 (which corresponds between April 4 and May 8 in the Gregorian Calendar for the Eastern Orthodox Churches of The East and Oriental using the Julian Calendar). In the southern hemisphere Easter occurs during autumn.

May 1 is the date of many holidays. [16] In many countries, May Day is synonymous with International Labor Day, or Labor Day, which celebrates the social and economic achievements of the labor movement. As a day of celebration, theholiday has ancient origins, and can relate to many customs that have survived in modern times. Many of these customs are due to May Day being a quarterly day, which means that (in the northern hemisphere where it is celebrated almost exclusively) falls roughly halfway between the spring equinox and the summer solstice. In Celtic tradition, this date marked the end of spring and the beginning of summer.

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