December weather in Union, MO
The average temperature in Union in December is 36.7°F (27.2°F–46.1°F). Average precipitation: 2.66 inches. Average snowfall is 2.9 inches.
December is a winter month in Union, and is cooler than the annual average of 56.9°F. Daily temperatures swing about 18.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 20m. For travel, December is cool.
Avg High
46.1°F
Avg Low
27.2°F
Precipitation
2.66 in
Snow
2.9 in
December records in Union
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (1970) | 12.9°F (1960) | 2.68 in (2006) |
| December 2 | 73.9°F (1982) | 6.1°F (1942) | 0.74 in (1993) |
| December 3 | 75.9°F (1970) | 10.9°F (1942) | 3.47 in (1982) |
| December 4 | 73.9°F (2001) | 6.1°F (2006) | 2.00 in (1982) |
| December 5 | 75.9°F (1998) | 14.0°F (2005) | 1.79 in (1999) |
| December 6 | 73.9°F (1939) | 3.9°F (1977) | 1.55 in (1960) |
| December 7 | 73.0°F (1966) | -5.1°F (1950) | 2.90 in (1956) |
| December 8 | 77.0°F (1991) | 3.9°F (1942) | 1.04 in (1956) |
| December 9 | 75.9°F (1939) | 0.0°F (2005) | 0.63 in (2007) |
| December 10 | 71.1°F (1996) | -0.9°F (1977) | 1.60 in (1971) |
| December 11 | 75.0°F (1949) | 1.0°F (1962) | 1.43 in (1985) |
| December 12 | 71.1°F (1991) | -9.9°F (1962) | 1.10 in (1972) |
| December 13 | 75.9°F (1948) | -4.0°F (1962) | 2.29 in (1923) |
| December 14 | 70.0°F (1975) | -2.0°F (1985) | 1.21 in (1971) |
| December 15 | 75.0°F (1948) | -4.0°F (1989) | 2.26 in (1987) |
| December 16 | 68.0°F (1939) | -16.1°F (1989) | 1.81 in (2001) |
| December 17 | 69.1°F (1939) | -11.0°F (1989) | 1.54 in (2001) |
| December 18 | 72.0°F (1939) | -6.0°F (1989) | 1.47 in (1959) |
| December 19 | 70.0°F (1997) | -7.1°F (1983) | 2.82 in (1995) |
| December 20 | 71.1°F (1941) | -11.0°F (1989) | 1.10 in (1987) |
| December 21 | 68.0°F (1967) | -11.9°F (1973) | 1.05 in (2007) |
| December 22 | 68.0°F (1940) | -17.0°F (1989) | 0.74 in (1990) |
| December 23 | 71.1°F (1982) | -23.1°F (1989) | 1.42 in (1981) |
| December 24 | 71.1°F (1955) | -11.9°F (1989) | 1.32 in (1982) |
| December 25 | 66.9°F (1960) | -14.1°F (1983) | 0.78 in (1987) |
| December 26 | 71.1°F (1942) | -6.0°F (1983) | 1.14 in (1987) |
| December 27 | 72.0°F (1971) | 1.9°F (1950) | 3.58 in (1942) |
| December 28 | 75.0°F (1984) | 1.9°F (1961) | 2.03 in (1968) |
| December 29 | 71.1°F (1984) | -11.0°F (1983) | 1.10 in (1946) |
| December 30 | 71.1°F (1965) | -18.9°F (1983) | 2.21 in (1990) |
| December 31 | 75.0°F (1951) | -9.0°F (1983) | 1.05 in (1974) |