Why does fall equinox happen in the first place? She said that “meteorologists and climatologists prefer to use the ‘meteorological calendar’ because not only do the dates not change - making it easy to remember - but also because it falls in line more with what people think traditional seasons are.” “For example, December 10, most people would consider winter, but if you are using the astronomical calendar, technically that is still considered autumn because it is before the winter solstice.” “This makes some dates tricky,” Chinchar says. Meteorological seasons are defined as the following: March 1 to May 31 is spring June 1 to August 31 is summer September 1 to November 30 is autumn and December 1 to February 28 is winter. These are perhaps the seasons that more people are familiar with,” Chinchar says. “Meteorological fall is different … in that the dates never change and are based on climatological seasons rather than Earth’s angle relative to the sun. Those dates can vary by a day or two each year,” she says. “Astronomical fall is essentially the time period from the autumnal equinox up to the winter solstice. Fall officially begins on the autumn equinox.īut there are actually two measures of the seasons: “the astronomical seasons” (which follow the arrivals of equinoxes and solstices) and what’s called the “meteorological seasons.”Īllison Chinchar, CNN meteorologist, explains the differences: Is the autumn equinox the official first day of fall? You can click here to see more cities (rounded down by one minute and adjusted for Daylight Saving Time). Going farther east, Dubai marks the exact event at 5:03 a.m.įor residents of Bangkok, it’s 8:03 a.m. For residents of Madrid, Berlin and Cairo, it comes at 3:03 a.m. Out West in San Diego and Vancouver, that means it arrives at 6:03 p.m.īut go in the other direction across the Atlantic Ocean, and the time change puts you into Friday. It comes at 8:03 p.m in Mexico City and Chicago. However, it will be 1:04 UTC according to the Royal Museums Greenwich and the US National Weather Service.įor people in places such as Toronto and Washington, DC, that’s 9:03 p.m. The equinox will arrive at 1:03 UTC (Coordinated Universal Time) Friday, September 23, according to NASA and.
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