December weather in Mount Vernon, WA
The average temperature in Mount Vernon in December is 40.6°F (35.3°F–45.9°F). Average precipitation: inches.
December is a winter month in Mount Vernon, and is cooler than the annual average of 51.4°F. Daily temperatures swing about 10.6°F between overnight low and afternoon high. Daylight averages about 8h 7m. For travel, December is cool.
Avg High
45.9°F
Avg Low
35.3°F
Precipitation
in
Daylight
8h 7m
December records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.0°F (1958) | 7.0°F (1985) | 1.95 in (1977) |
| December 2 | 59.0°F (1958) | 24.1°F (1963) | 1.18 in (1975) |
| December 3 | 60.1°F (1958) | 24.1°F (1994) | 1.02 in (1982) |
| December 4 | 55.9°F (1989) | 17.1°F (1972) | 1.08 in (1989) |
| December 5 | 57.9°F (2003) | 18.0°F (1956) | 0.78 in (2004) |
| December 6 | 57.9°F (1973) | 12.9°F (1980) | 1.11 in (1976) |
| December 7 | 55.9°F (1962) | 7.0°F (1980) | 0.80 in (1958) |
| December 8 | 57.9°F (1957) | 9.0°F (1972) | 1.19 in (1971) |
| December 9 | 57.0°F (1957) | 15.1°F (1972) | 1.86 in (1956) |
| December 10 | 63.0°F (1995) | 10.0°F (1972) | 0.79 in (1968) |
| December 11 | 57.9°F (1995) | 24.1°F (1963) | 1.01 in (1999) |
| December 12 | 62.1°F (2002) | 18.0°F (1972) | 0.46 in (1991) |
| December 13 | 60.1°F (1969) | 18.0°F (1972) | 1.81 in (1979) |
| December 14 | 62.1°F (1962) | 19.9°F (1967) | 1.70 in (1979) |
| December 15 | 63.0°F (1980) | 23.0°F (1967) | 1.28 in (1959) |
| December 16 | 57.9°F (1974) | 3.0°F (1964) | 0.55 in (2002) |
| December 17 | 57.9°F (1958) | 3.9°F (1964) | 0.89 in (1971) |
| December 18 | 57.0°F (1958) | 10.9°F (1964) | 0.41 in (1974) |
| December 19 | 57.9°F (2003) | 14.0°F (1990) | 0.60 in (1979) |
| December 20 | 57.9°F (1958) | 10.0°F (1990) | 0.85 in (1959) |
| December 21 | 57.9°F (1986) | 7.0°F (1990) | 0.86 in (1964) |
| December 22 | 57.0°F (1994) | 10.9°F (1983) | 0.40 in (1987) |
| December 23 | 57.9°F (1963) | 8.1°F (1983) | 0.68 in (1965) |
| December 24 | 64.9°F (1963) | 6.1°F (1983) | 2.05 in (1967) |
| December 25 | 61.0°F (1980) | 19.0°F (1962) | 1.75 in (1967) |
| December 26 | 63.0°F (1980) | 15.1°F (1971) | 1.08 in (1964) |
| December 27 | 57.9°F (1991) | 5.0°F (1971) | 0.51 in (1980) |
| December 28 | 55.9°F (1986) | 3.9°F (1968) | 0.88 in (1997) |
| December 29 | 55.9°F (1975) | -0.9°F (1968) | 1.20 in (1998) |
| December 30 | 57.9°F (1963) | 0.0°F (1968) | 0.95 in (1993) |
| December 31 | 59.0°F (1963) | 6.1°F (1968) | 0.62 in (1966) |