The autumnal equinox is this Thursday, Sept. 22, signaling the official end of summer and the beginning of the fall season. This year the equinox in Jackson will occur at 7:03 p.m., which will be the precise moment that the sun is directly overhead at the equator. The days around the equinox will be approximately 12 hours long, with an equal amount of night, almost everywhere across the globe.

For the remainder of the fall season, our days in Jackson Hole will be getting shorter and the sun a little lower in the sky as we roll closer to winter. No surprise, as this happens every year around this time.

Jim is the chief meteorologist at Mountainweather.com and has forecast the weather for Jackson Hole and the Tetons for the over 30 years.

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