December weather in Wilmington, IL
The average temperature in Wilmington in December is 32.1°F (23.7°F–40.5°F). Average precipitation: 2.33 inches. Average snowfall is 3.7 inches.
December is a winter month in Wilmington, and is cooler than the annual average of 52.9°F. Daily temperatures swing about 16.8°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 13m. For travel, December is cold.
Avg High
40.5°F
Avg Low
23.7°F
Precipitation
2.33 in
Snow
3.7 in
December records in Wilmington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1970) | 5.0°F (1964) | 2.38 in (1894) |
| December 2 | 73.9°F (2012) | 1.0°F (1929) | 1.13 in (1967) |
| December 3 | 73.0°F (1970) | -5.1°F (1929) | 5.60 in (1982) |
| December 4 | 73.0°F (2012) | 3.9°F (1929) | 1.80 in (1973) |
| December 5 | 70.0°F (1956) | 1.0°F (2025) | 1.82 in (1999) |
| December 6 | 71.1°F (1980) | 0.0°F (1977) | 0.75 in (1906) |
| December 7 | 70.0°F (1916) | -4.0°F (1976) | 1.53 in (1966) |
| December 8 | 69.1°F (1946) | -4.0°F (1917) | 0.92 in (1956) |
| December 9 | 73.0°F (1991) | -8.0°F (1917) | 0.90 in (1967) |
| December 10 | 66.0°F (1918) | -11.0°F (1917) | 1.33 in (1971) |
| December 11 | 70.0°F (1949) | -13.0°F (1917) | 1.40 in (1985) |
| December 12 | 63.0°F (1925) | -9.9°F (1962) | 1.96 in (1972) |
| December 13 | 68.0°F (1948) | -5.1°F (1903) | 0.90 in (1923) |
| December 14 | 70.0°F (1975) | -4.0°F (1898) | 1.30 in (1971) |
| December 15 | 73.9°F (1948) | -9.0°F (1989) | 1.70 in (1987) |
| December 16 | 71.1°F (1948) | -13.0°F (1932) | 1.40 in (1992) |
| December 17 | 66.0°F (1908) | -6.0°F (1932) | 1.56 in (1924) |
| December 18 | 68.0°F (1939) | -8.0°F (1981) | 2.10 in (1895) |
| December 19 | 61.0°F (1931) | -13.0°F (1983) | 3.26 in (1895) |
| December 20 | 68.0°F (1949) | -17.0°F (1981) | 0.96 in (2011) |
| December 21 | 66.0°F (1894) | -16.1°F (1989) | 1.95 in (1949) |
| December 22 | 62.1°F (1894) | -20.0°F (1989) | 0.60 in (1979) |
| December 23 | 68.0°F (1933) | -20.0°F (1989) | 2.30 in (1988) |
| December 24 | 66.9°F (1955) | -18.0°F (1989) | 1.43 in (1979) |
| December 25 | 70.0°F (2021) | -11.9°F (1983) | 2.05 in (1982) |
| December 26 | 69.1°F (1942) | -11.9°F (1914) | 0.50 in (2023) |
| December 27 | 68.0°F (1946) | -4.0°F (1925) | 2.93 in (2015) |
| December 28 | 64.9°F (1946) | -16.1°F (1924) | 1.50 in (1905) |
| December 29 | 72.0°F (2025) | -8.0°F (1917) | 1.66 in (2015) |
| December 30 | 69.1°F (1965) | -11.9°F (1909) | 1.18 in (1931) |
| December 31 | 66.0°F (1951) | -8.0°F (1976) | 2.42 in (2018) |