Fall officially began today, but in the West it won't feel like autumn.

“Meteorological” fall (aka autumn) is defined as the months of September, October and November.
But most people consider the first day of autumn to be the autumnal equinox, which this year is Thursday, September 22.
It won’t feel like fall in the West, where record-breaking heat is likely over the next few days.

Sick of sweltering summer heat? Well, you are in luck, because fall starts Thursday, at least according to meteorologists.

Here in the Northern Hemisphere, “meteorological” fall (aka autumn) is defined as the months of September, October and November. (It’s spring in the Southern Hemisphere).

But while some consider Sept. 1 the first day of autumn, crisp, cool temperatures will be hard to come by for many across the nation. And if you are in California, you won’t come close: Get ready to roast.

Astronomical seasons are different

Most people mark the first day of autumn on the autumnal equinox, which this year is Thursday, Sept. 22. That’s because, astronomically, the sun will be directly over the equator that day as the Earth`s tilt begins to point the Northern Hemisphere away from the sun.

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Astronomical fall is still three weeks away. People often say the “official” start of the seasons are the astronomical dates, though there is no legislative body that makes such a designation.

Meteorologists use our calendar

Meteorologists and climatologists need specific dates for the four seasons, so it makes sense for the seasons to follow our familiar monthly schedule. Scientists require set time periods to calculate averages and do year-to-year and decade-to-decade seasonal comparisons, WeatherBug meteorologist Mark Hoekzema said.

NOAA’s National Center for Environmental Information puts it this way: “By following the civil calendar and having less variation in season length and season start, it becomes much easier to calculate seasonal statistics from the monthly statistics, both of which are very useful for agriculture, commerce and a variety of other purposes.”

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So the three hottest months of June, July and August constitute summer, and the three coldest months of December, January and February are winter.

As for fall, September does usually tend to be more of a “fall-ish” month, while December is more wintry, so the meteorologists seem to have it right.

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