CHICOPEE, Mass. (WWLP) - The autumn equinox occurred at 2:19 p.m. on Monday, marking the transition into astronomical fall.

Meteorological fall spans September, October, and November, with average temperatures of 64 degrees in September, 53 degrees in October, and 41 degrees in November.

The autumn equinox is significant because it results in equal sunlight and darkness, and after this point, days become shorter and nights longer in the Northern Hemisphere.

Meteorological seasons are determined by climate and weather data, which differ from astronomical seasons. During the autumn equinox, the sun's rays pass through the equator going south, which eventually leads to the winter solstice.

This transition marks a shift in seasons between the Northern and Southern Hemispheres, where the So

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