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Far northern and southern regions get less sun due to the curvature of the sun, according to the Atmospheric Radiation Measurement (ARM) (opens in new tab) program.įor the continental United States, temperatures during autumn (September through November) average 55.9degrees Fahrenheit (13.3. This is because the equator gets a consistent amount of sun. Regions near the equator experience fairly constant temperatures throughout the year, while those farther north or south experience greater variations. How much of a change is felt depends on the location of the area on Earth. Falling temperaturesĪutumn brings a nip in the air. In the Southern Hemisphere, meteorological autumn occurs in March, April, and May. In the Northern Hemisphere, this is September, October, and November. Weather forecasters (opens in new tab) and some countries define the season as "meteorological autumn" by the three months in which the weather changes. In the Southern Hemisphere, the season runs from about March 20 to June 21. 21, though it varies from year to year, according to the MET Office (opens in new tab). In the Northern Hemisphere, that is from around Sept. The autumnal equinox is the beginning of "astronomical autumn," which ends with the start of winter. (Image credit: Getty Images) The different definitions of autumn A illustration of the Earth's position during four seasons.
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