Great Falls, MT Climate in December

Temperature for December

In Great Falls, MT during December the average high temperature is 36.7°F. The hottest day on record was December 28, 1980 when the temperature recorded was 63.0°F.

Great Falls, MT daily average and extreme temperature range for December

Low Temperature

Overnight in December the average temperature drops below freezing at 16.8°F, with the lowest temperature of -42.0°F being recorded on December 25, 1983. On average there are 9 days in December when the temperature stays below freezing all day. In the worst December there were 22 days when the temperature did not make it above freezing. Overnight temperatures drop below freezing between 19 and 31 times in December.

Precipitation for December

In December the average monthly rainfall in Great Falls, MT is 0.73 inches with rain usually falling on between 1 and 2 days. 1999 was the driest December with only 0.03 inches of rain falling, and 2006 was the wettest December with 3.44 inches of rain. The wettest single day in December was 29 December 2006 when 1.88 inches of rain fell.

In December it usually snows on between 9 and 9 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.