WASHINGTON (DC News Now) -- Classes are back in session across D.C., Maryland and Virginia, and the summer break is officially done. But now, it's almost time for a new season - Fall.

The flavors of pumpkin spice are back, and morning temperatures are starting to drop. The fall season is known for its autumn leaves, pumpkin patches, apple fields, ciders, creepy thrills of Halloween and the Thanksgiving holiday.

When is the official start of fall?

The official start of the Autumn Equinox in the northern hemisphere is Monday, Sept 22.

Throughout the three-month-long season, the Northern Hemisphere tilts away from the sun, leading to shorter days and longer nights.

What causes leaves to change color?

With shorter days, decreasing sunlight signals trees to stop producing chlorophyll, whi

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