Fall might not officially begin until Sept. 22 with the autumnal equinox, but meteorologists and climatologists actually consider Sept. 1 the beginning of autumn .

This is because the astronomical seasons are based on the Earth’s position relative to the sun, while "climatological" or "meteorological" seasons are divided into three-month periods based on the temperatures that would be expected during each season.

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For example, summer is the hottest time of the year and winter is the coldest time of the year, with fall and spring the transition seasons in between. So instead of focusing on the Earth’s orientation with respect to the sun, these so-called climatological seasons are solely classified by the annual temperature cycle across the world.

The hottes

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