During very cold weather the capacity of the air to containmoistureis greatly reduced. What water vapor remains is deposited as frost. At the same time, evaporation is reduced and therefore air humidity remains low. In these conditions snow cannot form.

Warmer air can hold more moisture beforesaturationpoint is reached and the water vapor begins to condense out. So when warmer air moves into cooler areas, not only do we feel the increase in temperature, but the excess vaporprecipitatesas snow.