The lowest temperature of a day generally occurs early in the ___________.
morning
The lowest temperature of a day generally occurs early in the morning, around sunrise.
This is because, during the night, in the absence of the Sun, heat is continuously lost by the Earth surface. Because of this the temperature drops. When the Sun rises, its rays do not reach us directly as a result, the temperature continues to fall further. Once the Sun's rays start becoming more direct, the temperature will begin to increase once again.