December weather in Lebanon, NH
The average temperature in Lebanon in December is 26.8°F (18.1°F–35.5°F). Average precipitation: 2.84 inches.
December is a winter month in Lebanon, and is cooler than the annual average of 46°F. Daily temperatures swing about 17.4°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 8h 46m. For travel, December is cold.
Avg High
35.5°F
Avg Low
18.1°F
Precipitation
2.84 in
Daylight
8h 46m
December records in Lebanon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.0°F (2020) | 0.0°F (1967) | 1.14 in (2006) |
| December 2 | 60.1°F (1998) | -0.9°F (1967) | 0.52 in (1985) |
| December 3 | 61.0°F (2009) | -2.9°F (1976) | 0.94 in (1967) |
| December 4 | 68.0°F (1982) | -4.0°F (1976) | 1.19 in (1968) |
| December 5 | 62.1°F (2001) | -6.0°F (2025) | 0.75 in (2017) |
| December 6 | 66.9°F (2001) | -2.7°F (2007) | 0.85 in (2003) |
| December 7 | 69.1°F (1998) | -7.1°F (1964) | 1.28 in (1976) |
| December 8 | 54.0°F (1974) | -9.0°F (1964) | 0.42 in (1972) |
| December 9 | 52.0°F (1980) | -9.9°F (2003) | 1.04 in (2014) |
| December 10 | 62.1°F (1966) | -8.0°F (1964) | 0.97 in (2023) |
| December 11 | 62.1°F (1966) | -16.1°F (1977) | 1.49 in (2024) |
| December 12 | 59.0°F (1979) | -20.9°F (1977) | 1.71 in (2008) |
| December 13 | 55.9°F (2010) | -8.0°F (2005) | 1.40 in (1983) |
| December 14 | 55.9°F (2006) | -11.9°F (2005) | 1.09 in (1968) |
| December 15 | 55.0°F (2015) | -10.8°F (2017) | 1.02 in (1968) |
| December 16 | 55.0°F (1982) | -9.9°F (1970) | 1.31 in (2022) |
| December 17 | 63.0°F (2021) | -19.8°F (2013) | 2.07 in (2000) |
| December 18 | 64.9°F (2023) | -14.8°F (2007) | 1.06 in (2023) |
| December 19 | 57.9°F (2025) | -14.1°F (1985) | 0.46 in (2008) |
| December 20 | 45.0°F (1967) | -17.0°F (1980) | 0.64 in (1999) |
| December 21 | 55.0°F (2018) | -20.0°F (1980) | 2.25 in (1973) |
| December 22 | 55.9°F (2018) | -15.0°F (1970) | 0.92 in (1969) |
| December 23 | 57.9°F (2004) | -15.9°F (2008) | 1.02 in (2022) |
| December 24 | 69.1°F (2015) | -13.0°F (1975) | 0.51 in (1970) |
| December 25 | 60.1°F (2020) | -24.0°F (1980) | 1.42 in (2002) |
| December 26 | 57.9°F (1982) | -25.1°F (1980) | 1.32 in (1969) |
| December 27 | 48.9°F (2016) | -20.7°F (2017) | 1.80 in (1969) |
| December 28 | 57.0°F (1982) | -24.9°F (2017) | 0.96 in (1968) |
| December 29 | 61.0°F (1984) | -18.8°F (2017) | 1.18 in (2025) |
| December 30 | 55.0°F (2024) | -25.8°F (2017) | 0.99 in (2019) |
| December 31 | 53.1°F (1965) | -23.1°F (1963) | 0.51 in (1972) |