2006-06-17 11:11:56 · 10 answers · asked by crazy_suave_cool 1 in Science & Mathematics ➔ Weather
Cooling occurs from the ground up. The ground is always radiating away heat and during night there's no heat received from the sun. Thus a calm & clear night tends to become colder as it progresses, and the temperature is lowest directly above the surface and increases going up - may be several °F colder a foot above the ground than where the thermometer is at about 6-7 feet.
Some sunshine is recieved with the twilight before sunrise, but very little. Even after sunrise, obstructions along the horizon can prevent heating of the ground right away. Once the ground is heated, it doesn't take long for the temperature at 6-7 feet above ground to increase - yet that is often after sunrise - especially with a snow cover which does not absorb sunlight well.
A phenomenon which can sometimes contribute to this is that with the first significant amount of heating, convection mixes the air right above the ground. As mentioned previously, that cooler air in the first foot or so can be kicked up and brought across the sensor at 6-7 feet for a brief time before the entire layer mixes and is warmer. A minimum temperature record was broken at KMPO airport this past December 14 that way - temperature decreased from -3° to -9° over a period of about 20 minutes just after sunrise. I had 2° only 3 miles away & 300 feet lower - occured here too, but not as much.
During a cloudy or breezy night, none of the above applies.
2006-06-17 16:44:57 · answer #1 · answered by Joseph 4 · 1⤊ 0⤋
Overnight, the earth is putting the heat it got during the day into space. The earth keeps cooling off until the sun comes up. It doesn't get the coldest at 2:00 in the morning. The coldest is right before sunrise.
2006-06-17 22:54:17 · answer #2 · answered by Hurricanehunter 2 · 0⤊ 0⤋
Well, I agree with the previous answers.
Question is... it does depend on where you live. In my city and, specifically, in my house, it's NEVER warmer in the evening. Midday is the warmest it can get LOL
Anyway, think of an oven. When you've lit it/switched it on, you won't feel much of a change. It's just after a while that you'll feel the difference in temperature. AND when you turn it off, you'll find that it remains warm for a while.
Ok, do you like my parallelism? hahaha
2006-06-17 18:22:03 · answer #3 · answered by elisatorres1978 2 · 0⤊ 0⤋
Because all night long, the earth is no longer receiving solar (shortwave) radiation from the sun, but it is constantly emitting infrared (longwave) radiation. So the coldest part of the day comes just before/at sunrise, because as the sunrises the earth is beginning to receive solar radiation again and can start to warm up.
2006-06-18 13:47:47 · answer #4 · answered by Bean 3 · 0⤊ 0⤋
Because sunrise is the time that had the most dark before it.
For example if it gets dark at 8pm at 3am there will have been 7 hours of dark but at 6am there will have been 10 hours of dark.
2006-06-17 18:16:41 · answer #5 · answered by satanorsanta 3 · 0⤊ 0⤋
It's windier in the daytime because the sun creates wind (due to solar flares).
2006-06-17 18:15:07 · answer #6 · answered by Galen 3 · 0⤊ 0⤋
i dont think its like that, the sun rarely affects the temp in the winter since its so far away
2006-06-17 18:15:37 · answer #7 · answered by meowmix 3 · 0⤊ 0⤋
Maybe that depends on the area you live in - it's just the other way round where I live.
2006-06-17 18:15:00 · answer #8 · answered by Eudora 3 · 0⤊ 0⤋
Could be due to cloud cover!
2006-06-17 18:15:50 · answer #9 · answered by JEFFAVEGRL 4 · 0⤊ 0⤋
because that is the coldest time of the day
2006-06-17 18:14:42 · answer #10 · answered by Ilya 4 · 0⤊ 0⤋