Average Temperatures for New Hampshire in December





Average temperatures for December at cities, communities and other locations around around New Hampshire are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for Southern and Northern New Hampshire.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Southern New Hampshire

Average December temperatures
High °F Low °F Place High °C Low °C
37 20 Concord 3 -7
38 21 Durham 3 -6
35 17 Franklin Falls Reservoir Dam 2 -8
36 18 Keene 2 -8
36 20 Laconia & Lakeport 2 -7
36 18 Lebanon 2 -8
38 21 Massabesic Lake 3 -6
34 20 Mount Sunapee 1 -7
40 21 Nashua 4 -6
38 22 Portsmouth & Greenland 3 -5
37 22 Rochester 3 -6

Northern New Hampshire

Average daily temperatures in December
High °F Low °F Place High °C Low °C
32 14 Berlin 0 -10
33 12 Bethlehem 1 -11
30 10 Colebrook -1 -12
29 11 First Connecticut Lake -2 -12
20 4 Mount Washington -7 -16
36 18 North Conway 2 -8
32 14 Pinkham Notch 0 -10
34 15 Plymouth 1 -10
34 15 Tamworth 1 -9
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

New Hampshire Temperatures
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