Portland, ME Climate in December

Temperature for December

In Portland, ME during December the average high temperature is 39.2°F. The hottest day on record was December 7, 2001 when the temperature recorded was 71.1°F.

Portland, ME daily average and extreme temperature range for December

Low Temperature

Overnight in December the average temperature drops below freezing at 19.5°F, with the lowest temperature of -20.0°F being recorded on December 20, 1975. On average there are 8 days in December when the temperature stays below freezing all day. In the worst December there were 27 days when the temperature did not make it above freezing. Overnight temperatures drop below freezing between 21 and 31 times in December.

Precipitation for December

In December the average monthly rainfall in Portland, ME is 4.26 inches with rain usually falling on between 8 and 9 days. 1980 was the driest December with only 1.08 inches of rain falling, and 1983 was the wettest December with 10.26 inches of rain. The wettest single day in December was 4 December 1990 when 3.02 inches of rain fell.

In December it usually snows on between 9 and 10 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.