December weather in New Haven, CT
The average temperature in New Haven in December is 36.3°F (28.9°F–43.7°F). Average precipitation: 3.53 inches.
December is a winter month in New Haven, and is cooler than the annual average of 52°F. Daily temperatures swing about 14.8°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 2m. For travel, December is cold.
Avg High
43.7°F
Avg Low
28.9°F
Precipitation
3.53 in
Daylight
9h 2m
December records in New Haven
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.0°F (2001) | 15.1°F (1967) | 0.98 in (2010) |
| December 2 | 57.0°F (2021) | 16.0°F (1967) | 1.75 in (1974) |
| December 3 | 64.0°F (2009) | 10.9°F (1976) | 1.25 in (1967) |
| December 4 | 60.1°F (1973) | 12.9°F (1966) | 2.73 in (1968) |
| December 5 | 62.1°F (2001) | 14.0°F (2025) | 1.47 in (2020) |
| December 6 | 64.0°F (2001) | 12.9°F (2002) | 1.44 in (1972) |
| December 7 | 60.1°F (1951) | 14.0°F (1970) | 1.63 in (1976) |
| December 8 | 62.1°F (1951) | 12.9°F (1964) | 1.69 in (1969) |
| December 9 | 60.1°F (1966) | 8.1°F (1968) | 1.70 in (2014) |
| December 10 | 61.0°F (2023) | 5.0°F (1968) | 2.94 in (2023) |
| December 11 | 62.1°F (2024) | 3.9°F (1958) | 1.66 in (2008) |
| December 12 | 61.0°F (2015) | 8.1°F (1960) | 2.65 in (2010) |
| December 13 | 61.0°F (2020) | 6.1°F (1960) | 1.35 in (2009) |
| December 14 | 60.1°F (2015) | 7.0°F (1958) | 2.23 in (1954) |
| December 15 | 61.0°F (2015) | 7.0°F (1960) | 0.91 in (1950) |
| December 16 | 59.0°F (2021) | 10.0°F (1961) | 1.61 in (2005) |
| December 17 | 61.0°F (2024) | 7.0°F (1951) | 1.01 in (2003) |
| December 18 | 62.1°F (2023) | 12.0°F (1953) | 1.77 in (2023) |
| December 19 | 57.9°F (2025) | 10.9°F (1960) | 1.53 in (1948) |
| December 20 | 57.0°F (2002) | 3.0°F (1955) | 0.88 in (2002) |
| December 21 | 60.1°F (1957) | 1.0°F (1955) | 1.84 in (1973) |
| December 22 | 60.1°F (2013) | 7.0°F (1958) | 1.15 in (1972) |
| December 23 | 60.1°F (2015) | 6.1°F (1955) | 1.06 in (2006) |
| December 24 | 62.1°F (2015) | 8.1°F (1960) | 0.83 in (1966) |
| December 25 | 64.0°F (2015) | 3.0°F (1948) | 1.43 in (2020) |
| December 26 | 57.0°F (2015) | 1.9°F (1968) | 1.61 in (1975) |
| December 27 | 64.9°F (1973) | -2.9°F (1948) | 0.67 in (1964) |
| December 28 | 59.0°F (2008) | 0.0°F (1950) | 1.75 in (2023) |
| December 29 | 55.9°F (2024) | 9.1°F (2017) | 1.18 in (2013) |
| December 30 | 57.0°F (2022) | -2.0°F (1962) | 1.61 in (1948) |
| December 31 | 57.0°F (1965) | -2.0°F (1962) | 2.93 in (1948) |