On the hillside, why is the freezing damage on the east and west slopes more serious than that on the west and southwest slopes?

The north slope is heavy and the south slope is light; The east and southeast slopes are heavy, while the west and southwest slopes are light; Steep slopes are lighter than gentle slopes. Frost includes advection frost, radiation frost and advection radiation frost.

When cold air invades, the sky is cloudless or partly cloudy, the air humidity is low, and there is no wind or breeze, which is most conducive to the radiation cooling of the ground and near-ground air layer, and it is prone to severe frost.