December weather in Summit, NJ
The average temperature in Summit in December is 35.9°F (27.6°F–44.1°F). Average precipitation: 4.43 inches. Average snowfall is 4.1 inches.
December is a winter month in Summit, and is cooler than the annual average of 53.3°F. Daily temperatures swing about 16.5°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 6m. For travel, December is cold.
Avg High
44.1°F
Avg Low
27.6°F
Precipitation
4.43 in
Snow
4.1 in
December records in Summit
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1991) | 3.9°F (1936) | 2.13 in (2020) |
| December 2 | 71.1°F (2006) | 5.0°F (1967) | 2.03 in (1974) |
| December 3 | 68.0°F (2009) | 6.1°F (1938) | 1.77 in (1986) |
| December 4 | 70.0°F (1998) | 1.9°F (1940) | 2.32 in (1990) |
| December 5 | 75.9°F (1998) | 8.1°F (1935) | 2.01 in (1993) |
| December 6 | 72.0°F (2001) | 10.0°F (1976) | 1.96 in (1952) |
| December 7 | 73.0°F (2001) | 5.0°F (1940) | 1.56 in (1959) |
| December 8 | 75.9°F (1998) | 9.0°F (1934) | 2.00 in (2011) |
| December 9 | 63.0°F (1951) | 8.1°F (1934) | 1.55 in (2009) |
| December 10 | 73.9°F (1946) | 0.0°F (1958) | 1.02 in (1973) |
| December 11 | 69.1°F (1966) | -2.9°F (1958) | 2.06 in (1992) |
| December 12 | 66.9°F (1931) | 3.0°F (1988) | 2.80 in (2008) |
| December 13 | 70.0°F (2015) | 3.0°F (1988) | 2.97 in (1983) |
| December 14 | 70.0°F (2015) | 1.0°F (1958) | 2.77 in (1983) |
| December 15 | 64.9°F (2015) | -0.9°F (1960) | 1.69 in (1954) |
| December 16 | 66.0°F (2008) | -0.9°F (1943) | 2.00 in (2005) |
| December 17 | 62.1°F (1971) | -8.0°F (1942) | 1.93 in (2018) |
| December 18 | 64.9°F (2000) | -7.1°F (1942) | 1.32 in (2000) |
| December 19 | 61.0°F (1984) | -2.0°F (1932) | 1.60 in (1986) |
| December 20 | 57.9°F (1967) | -9.9°F (1960) | 2.27 in (1936) |
| December 21 | 61.0°F (2018) | -9.0°F (1942) | 2.08 in (1973) |
| December 22 | 69.1°F (2013) | -8.0°F (1945) | 1.06 in (1972) |
| December 23 | 68.0°F (2013) | -7.1°F (1945) | 1.56 in (2022) |
| December 24 | 66.9°F (2015) | -9.0°F (1945) | 1.47 in (2015) |
| December 25 | 66.9°F (2015) | -7.1°F (1980) | 1.70 in (1966) |
| December 26 | 66.9°F (1964) | -8.0°F (1980) | 1.70 in (1945) |
| December 27 | 73.9°F (1982) | -11.9°F (1948) | 1.85 in (1947) |
| December 28 | 62.1°F (1949) | -16.1°F (1933) | 2.21 in (2023) |
| December 29 | 66.0°F (2008) | -5.1°F (1933) | 1.34 in (1966) |
| December 30 | 71.1°F (1984) | -11.0°F (1933) | 1.45 in (1997) |
| December 31 | 62.1°F (2022) | -11.9°F (1935) | 3.03 in (1948) |