Countdown to Fall

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PHOENIX (3TV/CBS 5) -

This week, we are all breaking into our “Happy Dance” as the temperatures around the Valley drop into the 90s during the day and 70s at night. For Arizonans, it’s the signal that summer is finally coming to an end.

For the high country, overnights begin to drop to the freezing mark and ski resorts around our state begin to prepare for the upcoming ski season.

So the season of change is here, Fall Equinox! When, what and why does it happen? For that, we consult the Old Farmer’s Almanac.

For Arizona, it happens on Friday, September 22 at 1:02 pm.

The Fall Equinox in the Northern Hemisphere is the first day of Fall. In the Southern Hemisphere, they call it Autumn Equinox. Although there are several starts and calendar dates for the changes of the season, this date is typically when we do see and feel the change in our temperatures.

So why does it change? We have four seasons which are mainly driven by shifting sunlight. This is determined on how the earth orbits the sun and the tilt of its axis.   

On the Fall Equinox, day and night are exactly 12 hours each. The process on this day is as such, the sun crosses the celestial equator going southward. It then rises exactly due east and sets exactly due west.

So count down the days and get ready. Fall is right around the corner. 

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Copyright 2017 KPHO/KTVK (KPHO Broadcasting Corporation). All rights reserved.


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