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The coldest part of the day is NOT 1 hour before dawn.
All other factors being equal, the coldest part of the day generally occurs about 30 minutes AFTER sunrise.
It may seem logical to think that air temperature bottoms out just before sunrise and then begins to warm with dawn's early light.
However:
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.
Now, remember that if clouds toll in or a front comes in during the night, this will have an effect. But as a rule of thumb: the coldest temperature is about 30 minutes after sunrise.
The earth continues to radiate away it's heat, even though the sun has risen it is still too weak to warm the atmosphere, and the earth is still emitting radiation, even more so due to semi-diurnal tides(sea tides, gravitational forces from the moon and sun)create a situation where the air vapor is at it lowest, therefore no insulation to hold surface warmth.
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