December weather in Union, IA
The average temperature in Union in December is 23.3°F (15.0°F–31.6°F). Average precipitation: 1.62 inches. Average snowfall is 8.4 inches.
December is a winter month in Union, and is cooler than the annual average of 46.9°F. Daily temperatures swing about 16.6°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 55m. For travel, December is cold.
Avg High
31.6°F
Avg Low
15.0°F
Precipitation
1.62 in
Snow
8.4 in
December records in Union
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1962) | -2.9°F (1976) | 0.95 in (1981) |
| December 2 | 63.0°F (1998) | -2.9°F (1985) | 1.17 in (2007) |
| December 3 | 62.1°F (1973) | -9.9°F (1985) | 0.56 in (1990) |
| December 4 | 66.0°F (2012) | -7.1°F (1991) | 0.82 in (2011) |
| December 5 | 66.0°F (2017) | -9.0°F (2005) | 1.25 in (1973) |
| December 6 | 66.0°F (2001) | -8.0°F (1972) | 0.76 in (1982) |
| December 7 | 51.1°F (2001) | -15.0°F (1976) | 1.02 in (1994) |
| December 8 | 53.1°F (1984) | -11.9°F (1976) | 0.32 in (1977) |
| December 9 | 50.0°F (1970) | -20.9°F (1958) | 0.93 in (2009) |
| December 10 | 55.0°F (2020) | -11.9°F (1958) | 0.68 in (1964) |
| December 11 | 57.9°F (1965) | -11.0°F (1976) | 0.64 in (1965) |
| December 12 | 55.9°F (1965) | -11.9°F (1962) | 0.52 in (1991) |
| December 13 | 60.1°F (1968) | -18.0°F (1958) | 1.39 in (2015) |
| December 14 | 51.1°F (1975) | -18.0°F (1985) | 2.58 in (2015) |
| December 15 | 55.0°F (2021) | -16.1°F (1989) | 0.58 in (2012) |
| December 16 | 71.1°F (2021) | -13.0°F (1963) | 0.51 in (2014) |
| December 17 | 52.0°F (2017) | -13.0°F (1983) | 0.35 in (2008) |
| December 18 | 55.9°F (1962) | -20.0°F (1983) | 0.81 in (2002) |
| December 19 | 55.0°F (1976) | -20.9°F (1983) | 1.17 in (1968) |
| December 20 | 52.0°F (1988) | -20.0°F (1983) | 0.92 in (2012) |
| December 21 | 53.1°F (1967) | -22.0°F (1963) | 1.01 in (2006) |
| December 22 | 51.1°F (1979) | -20.0°F (1963) | 0.56 in (1968) |
| December 23 | 52.0°F (2019) | -22.0°F (1989) | 0.87 in (2014) |
| December 24 | 46.0°F (2019) | -23.1°F (1983) | 0.54 in (2015) |
| December 25 | 51.1°F (1982) | -20.0°F (1983) | 1.11 in (2009) |
| December 26 | 57.9°F (2019) | -20.9°F (1962) | 0.49 in (1996) |
| December 27 | 51.1°F (1959) | -13.0°F (2017) | 1.36 in (2018) |
| December 28 | 55.0°F (1984) | -14.1°F (2017) | 0.70 in (1987) |
| December 29 | 64.9°F (1984) | -13.0°F (1993) | 0.95 in (2019) |
| December 30 | 55.0°F (1965) | -11.9°F (1963) | 0.77 in (1972) |
| December 31 | 57.9°F (1965) | -17.0°F (1976) | 0.98 in (2006) |