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 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. In the Northern Hemisphere, that is from around September 22 to about December 22, though it varies from year to year, according to the NOAA. The autumnal equinox is the beginning of "astronomical autumn," which ends with the start of winter. Thus, daylight on any given day lasts roughly six or seven minutes longer than it seemingly should. ![]() Because of the way the sun's light refracts in Earth's atmosphere, we can actually see the sun for a few minutes before its disk rises and for a few minutes after it has truly set. Day and night are not exactly 12 hours each.
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