Northwest meteorologist Cliff Mass has a nice article on this phenomenon:
Huge daily temperature range hits the Northwest
Often during the late summer and early fall, a huge daily temperature range is observed at Northwest stations, particularly those away from the water.
Here in western Washington for example, stations like Olympia have risen into the 80s during day, but drop in the mid-30s at night.
And some locations in eastern Oregon have dropped below freezing!
Clear night skies and longer nights promote radiation cooling while we have the warm dry air in the daytime. Gorgeous weather - cool nights (great snuggle weather) and still wonderful warm Indian Summer days (although this is scheduled to go away mid next week).
Last night it got down to 38.8° and up to 80°. Last Thursday night it was 32.8°
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