 In general, frost is more common than snow, requiring temperatures of 32 °F (0 °C) or less at above sea level, a cloudless sky, and a relative humidity of 65% or more.Generally, for snow to occur, the polar jet stream must move southward through Texas and into the Gulf of Mexico, with a stalled cold front across the southern portion of the state curving northeastward to combine freezing air into the frontal clouds.While light snowfall occurs a few times each decade across the northern panhandle, most of the state is too far south of the cold continental air masses responsible for generating snowfall in the rest of the country.