December weather in Herndon, VA
The average temperature in Herndon in December is 37.7°F (29.0°F–46.5°F). Average precipitation: 3.30 inches. Average snowfall is 2.8 inches.
December is a winter month in Herndon, and is cooler than the annual average of 55.7°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 17m. For travel, December is cool.
Avg High
46.5°F
Avg Low
29.0°F
Precipitation
3.30 in
Snow
2.8 in
December records in Herndon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.0°F (2006) | 3.9°F (1967) | 2.02 in (1974) |
| December 2 | 75.0°F (1970) | 0.0°F (1967) | 1.42 in (1986) |
| December 3 | 73.9°F (1998) | 7.0°F (1976) | 1.14 in (1967) |
| December 4 | 75.0°F (1998) | 10.0°F (1966) | 1.18 in (1993) |
| December 5 | 77.0°F (2001) | 12.0°F (1966) | 1.02 in (2003) |
| December 6 | 79.0°F (1998) | 9.0°F (2002) | 1.03 in (2016) |
| December 7 | 77.0°F (1998) | 1.0°F (2002) | 2.14 in (2011) |
| December 8 | 75.9°F (1980) | 12.9°F (2002) | 1.24 in (1972) |
| December 9 | 72.0°F (1978) | 10.9°F (1989) | 1.12 in (1973) |
| December 10 | 70.0°F (1966) | 3.9°F (1989) | 2.26 in (1992) |
| December 11 | 71.1°F (1979) | 3.0°F (1968) | 1.51 in (2024) |
| December 12 | 72.0°F (1979) | 9.0°F (1988) | 0.95 in (1964) |
| December 13 | 73.0°F (2015) | 7.0°F (1988) | 1.47 in (1996) |
| December 14 | 69.1°F (2015) | 3.0°F (1989) | 1.24 in (2020) |
| December 15 | 71.1°F (1971) | 5.0°F (1989) | 2.49 in (2018) |
| December 16 | 72.0°F (1971) | 9.1°F (2016) | 1.30 in (2020) |
| December 17 | 70.0°F (1984) | 3.0°F (1989) | 1.91 in (2023) |
| December 18 | 75.9°F (2006) | 3.0°F (1989) | 2.92 in (1977) |
| December 19 | 63.0°F (1967) | -2.0°F (1989) | 1.34 in (2009) |
| December 20 | 64.0°F (1988) | 8.1°F (1991) | 0.66 in (1973) |
| December 21 | 70.0°F (2013) | 3.9°F (1989) | 1.15 in (1973) |
| December 22 | 71.1°F (2013) | 1.9°F (1989) | 2.14 in (2022) |
| December 23 | 68.0°F (1990) | 3.9°F (1989) | 1.30 in (2004) |
| December 24 | 71.1°F (2015) | 1.0°F (1983) | 2.01 in (1986) |
| December 25 | 71.1°F (1964) | -4.0°F (1989) | 0.82 in (1969) |
| December 26 | 71.1°F (1964) | -0.9°F (1983) | 1.41 in (2012) |
| December 27 | 73.0°F (1971) | 1.0°F (1989) | 1.04 in (1964) |
| December 28 | 73.0°F (1984) | 8.1°F (1966) | 1.74 in (1967) |
| December 29 | 78.1°F (1984) | 7.0°F (1977) | 1.27 in (2013) |
| December 30 | 66.9°F (1990) | 3.9°F (1963) | 0.87 in (1969) |
| December 31 | 73.0°F (1992) | 1.0°F (1993) | 1.90 in (1975) |