2007-01-19 05:06:37 · 5 answers · asked by Gabriela 1 in Science & Mathematics ➔ Earth Sciences & Geology
Clear skys and low humidity. Clouds reflect some heat back to the surface. Water vapor is a greenhouse gas so the less humidity the more heat is lost from the atmosphere.
This is why deserts cool off so much at night.
2007-01-19 09:04:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Clouds reflect radiating heat back down to the earth. On a clear night, without this reflection, the air temperature will drop more than on a cloudy night.
2007-01-19 13:11:43 · answer #2 · answered by rt11guru 6 · 1⤊ 0⤋
A cloudless sky does allow more heat to radiate to space. Also, low humidity and no wind help the process. I believe, also. that the air at higher elevations will drop faster (of course, it may not get as warm during the day, as well).
2007-01-19 15:51:32 · answer #3 · answered by David A 5 · 0⤊ 0⤋
Clear conditions. The earth radiates its heat away to outer space.
2007-01-19 13:12:39 · answer #4 · answered by Steve 7 · 0⤊ 0⤋
no cloudcover
2007-01-19 14:49:26 · answer #5 · answered by Beach_Bum 4 · 0⤊ 0⤋