For some Americans, the air is getting crisper and the leaves are starting to change as fall approaches — but one thing's certain no matter your local weather: The days are getting shorter.
The big picture: Parts of the northern U.S. are losing more than three hours of daylight between June 20 (the summer solstice) and Sept. 22 (the fall equinox), per NOAA's handy Solar Calculator.
How it works: Here in the Northern Hemisphere, northern latitudes lose more daylight in the fall and winter compared to areas closer to the equator as the Sun's path through the sky shifts southward.
Worthy of your time: Personally, I thrive in the cooler months. But if you struggle with the winter blues, read my colleague Carly Mallenbaum's story on dealing with seasonal affective disorder or seasonal depression.