Why Does It Get Colder On Clear Nights?

Tools

By By Steve Pool

SEATTLE - It seems odd, but it usually gets colder at night from warm sunny days than cool, cloudy days.

That's because clouds can act like a blanket. The clouds can keep a good chunk of sunlight out during the day, keeping us cooler in the afternoons. But the clouds will also trap in whatever warmth we get during the day, keeping us warmer at night.

Thus, after a sunny and warm day where we might get to 55 during the day, a clear night will allow that heat to be radiated out back into space, dropping temperatures near freezing. While a cloudy and 45 degree day might only get down to the upper 30s at night.

Your Photos

YouNews Up! Up! And away! Up! Up! And away!
When I saw this dramatic cloud to the north, it reminded me of smoke, rising in billows until it hits the jet stream, then it's pulled hundreds of miles east. I had to capture it quickly. Within minutes the effect had faded.
YouNews Inside an osprey nest Inside an osprey nest
For my girlfriends birthday we had a party at her parents. We knew the nest was there but the owner hadn't seen or heard the osprey for a day or two. He asked me to fly my drone up and see if any was wrong. I flew up and found that there were two eggs inside.
YouNews Our Garden Our Garden
The growing season has been great.

The secret to this garden is simple.
I used recycled grass clippings.