Temperature for December
In San Antonio, TX during December the average high temperature is 65.7°F. The hottest day on record was December 25, 1955 when the temperature hit 89.1°F.
Precipitation for December
In December the average monthly rainfall in San Antonio, TX is 0.82 inches with rain usually falling on between 10 and 11 days. 1938 was the driest December with only 0.00 inches of rain falling, and 1991 was the wettest December with 13.68 inches of rain. The wettest single day in December was 20 December 1991 when 4.92 inches of rain fell.
In December it usually snows on between 0 and 1 days. In December there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in December.