On 12/27/2015 9:49 AM, Don Y wrote:

I also can't understand why it always gets *colder*
as the Sun is rising!


All objects gain heat from outside sources and radiate it away at the
same time. When more radiant heat is lost than gained, the object cools.
When more heat is gained than lost, it warms. If they are balanced, the
temperature remains constant. Okay… that’s pretty basic. Between sunset
and sunrise, the Earth’s surface gathers no solar energy but continues
to radiate away its stored heat. During the night, the surface also
loses radiant heat faster than it steals heat from other sources, and
thus its temperature, and that of the air in contact with it, drops
steadily. At dawn, when the first light beams across the landscape, the
incoming solar radiation is very weak. It does not yet have enough
strength to counter all the heat escaping from the surface. As a result,
the surface continues to lose heat for some time following sunrise, and
the air temperature continues to fall. At some point, the solar rays
shine strongly enough to counter the heat loss. The gain-loss balance is
shifted, and the air finally begins to warm up. As a rule of thumb: the
coldest temperature is about an hour after sunrise.

Reference
https://www.physicsforums.com/thread...unrise.756343/