December weather in Union, IL
The average temperature in Union in December is 26.5°F (18.5°F–34.5°F). Average precipitation: 1.94 inches. Average snowfall is 9.3 inches.
December is a winter month in Union, and is cooler than the annual average of 48.2°F. Daily temperatures swing about 16°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 8h 56m. For travel, December is cold.
Avg High
34.5°F
Avg Low
18.5°F
Precipitation
1.94 in
Snow
9.3 in
December records in Union
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1962) | -11.0°F (1893) | 1.50 in (2006) |
| December 2 | 64.9°F (1962) | -8.0°F (1893) | 1.56 in (1950) |
| December 3 | 64.0°F (1982) | -15.0°F (1940) | 2.21 in (1982) |
| December 4 | 66.9°F (2012) | -9.9°F (1893) | 0.84 in (1920) |
| December 5 | 62.1°F (2017) | -5.1°F (2007) | 2.32 in (1909) |
| December 6 | 57.9°F (1946) | -4.0°F (1893) | 0.70 in (1943) |
| December 7 | 64.0°F (1916) | -9.9°F (1936) | 1.20 in (1980) |
| December 8 | 64.9°F (1946) | -8.0°F (1902) | 0.98 in (1916) |
| December 9 | 60.1°F (1946) | -14.1°F (1958) | 0.53 in (1953) |
| December 10 | 55.9°F (1911) | -18.0°F (1919) | 1.89 in (2003) |
| December 11 | 60.1°F (1949) | -14.1°F (1972) | 1.25 in (1899) |
| December 12 | 57.0°F (1949) | -11.0°F (1962) | 1.02 in (1946) |
| December 13 | 61.0°F (2015) | -20.0°F (1903) | 1.53 in (1920) |
| December 14 | 61.0°F (2015) | -13.0°F (1901) | 1.64 in (2015) |
| December 15 | 59.0°F (1971) | -16.1°F (1901) | 1.95 in (1971) |
| December 16 | 55.0°F (1984) | -15.0°F (1932) | 1.12 in (1921) |
| December 17 | 57.9°F (1984) | -14.1°F (1951) | 0.76 in (1921) |
| December 18 | 53.1°F (1939) | -14.1°F (1922) | 0.74 in (1957) |
| December 19 | 54.0°F (2002) | -20.0°F (2016) | 0.63 in (2002) |
| December 20 | 55.0°F (1949) | -18.0°F (1983) | 2.22 in (1895) |
| December 21 | 55.9°F (1967) | -17.0°F (1989) | 1.18 in (1949) |
| December 22 | 53.1°F (1957) | -17.0°F (1989) | 0.55 in (2006) |
| December 23 | 57.0°F (1941) | -18.0°F (1960) | 0.68 in (1932) |
| December 24 | 57.9°F (2015) | -23.1°F (1983) | 1.50 in (1965) |
| December 25 | 59.0°F (1982) | -22.0°F (1983) | 1.98 in (2009) |
| December 26 | 59.0°F (1982) | -18.9°F (1914) | 0.57 in (1916) |
| December 27 | 54.0°F (1959) | -26.0°F (1950) | 1.17 in (1942) |
| December 28 | 60.1°F (1982) | -22.0°F (1924) | 0.76 in (1927) |
| December 29 | 62.1°F (1984) | -11.0°F (2017) | 1.88 in (2015) |
| December 30 | 59.0°F (1936) | -15.0°F (1909) | 0.83 in (1936) |
| December 31 | 55.9°F (2002) | -16.1°F (1914) | 0.68 in (1949) |