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|Climbing out of the Winterscene....searching S-P-R-I-N-G||by powerfocusfotografie on Flickr|
A season is a sub-division of
the year, marked by changes in weather, ecology, and hours
Seasons result from the yearly revolution of
the Earth around the Sun and the tilt of the Earth's
axis relative to the plane of revolution.
In temperate and polar regions, seasons are
marked by changes in the intensity of sunlight that reaches the Earth's
surface, variations of which may cause animals to go into hibernation or to
migrate, and plants to be dormant.
|So, farewell then British Summer Time||by Mukumbura on Flickr|
- During May, June and July, the northern hemisphere is exposed to more direct sunlight because the
hemisphere faces the sun.
same is true of the southern hemisphere in November,
December and January.
due to seasonal lag, June, July and August are the hottest months in
the northern hemisphere and December, January and February are the hottest
months in the southern hemisphere
|Spring in Esk Street, Invercargill, Southland, New Zealand, 9 September 2005||by PhillipC on Flickr|
- Hot regions have two or three seasons; the rainy (or wet, or monsoon) season and the dry season, and in some tropical areas, a cool or mild season
- Temperate and sub-polar regions,
have generally four calendar-based seasons: spring, summer, autumn and winter.
- However, ecologists mostly use a six season model for temperate climate regions that includes pre-spring and late
summer as distinct seasons along with the traditional four.
|Irresistable maples||by ellenm1 on Flickr|
- Estival (high summer): Begins June in
most temperate climates. Trees are full of leaves. Birds hatch and raise
- Serotinal (late summer): Generally
begins mid to late August. Deciduous leaves begin to change color. Young birds
reach maturity and join other adult birds preparing for fall migration.
- Autumnal (fall): Generally begins mid
to late September. Tree leaves in full color then turn brown and fall to the
ground. Birds migrate back to wintering areas.
- Hibernal (winter): Begins December
(mild temperate), November (cool temperate). Deciduous trees are bare and
fallen leaves begin to decay. Migrating birds settled in winter habitats.