December weather in Harristown, IL
The average temperature in Harristown in December is 31.8°F (25.0°F–38.6°F). Average precipitation: 2.40 inches. Average snowfall is 3.5 inches.
December is a winter month in Harristown, and is cooler than the annual average of 53°F. Daily temperatures swing about 13.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 11m. For travel, December is cold.
Avg High
38.6°F
Avg Low
25.0°F
Precipitation
2.40 in
Snow
3.5 in
December records in Harristown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (1970) | 1.0°F (1893) | 1.07 in (1977) |
| December 2 | 70.0°F (1982) | 1.0°F (1929) | 2.37 in (1967) |
| December 3 | 72.0°F (1970) | -7.1°F (1929) | 1.65 in (1982) |
| December 4 | 71.1°F (1998) | -6.0°F (1893) | 1.64 in (1920) |
| December 5 | 70.0°F (1956) | -4.0°F (2025) | 1.48 in (1906) |
| December 6 | 70.0°F (1980) | -2.0°F (1977) | 1.14 in (1972) |
| December 7 | 66.9°F (1946) | -2.0°F (1976) | 1.55 in (1966) |
| December 8 | 68.0°F (1916) | -4.0°F (1909) | 1.22 in (1901) |
| December 9 | 70.0°F (1918) | -8.0°F (1917) | 0.81 in (1967) |
| December 10 | 66.0°F (1918) | -9.9°F (1917) | 2.17 in (1971) |
| December 11 | 64.9°F (1949) | -11.9°F (1917) | 1.40 in (1983) |
| December 12 | 66.9°F (2015) | -9.9°F (1962) | 1.75 in (1972) |
| December 13 | 66.0°F (1975) | -8.0°F (1903) | 2.72 in (1901) |
| December 14 | 64.9°F (1975) | -11.0°F (2025) | 1.32 in (2022) |
| December 15 | 66.9°F (1948) | -13.0°F (1901) | 1.43 in (1971) |
| December 16 | 66.0°F (1984) | -9.9°F (1989) | 0.85 in (1992) |
| December 17 | 62.1°F (1984) | -5.1°F (1989) | 1.46 in (1924) |
| December 18 | 64.9°F (1908) | -6.0°F (1981) | 2.85 in (1895) |
| December 19 | 61.0°F (1957) | -15.0°F (1901) | 1.75 in (1895) |
| December 20 | 64.0°F (1988) | -15.0°F (1981) | 1.04 in (1973) |
| December 21 | 64.0°F (1941) | -16.1°F (1989) | 2.19 in (1949) |
| December 22 | 61.0°F (1933) | -20.9°F (1989) | 0.96 in (1898) |
| December 23 | 66.0°F (1933) | -20.0°F (1989) | 2.16 in (1988) |
| December 24 | 64.0°F (1893) | -22.0°F (1983) | 1.48 in (2009) |
| December 25 | 63.0°F (1982) | -17.0°F (1983) | 0.77 in (1982) |
| December 26 | 64.9°F (1942) | -15.0°F (1914) | 2.81 in (2015) |
| December 27 | 64.0°F (2008) | -7.1°F (1935) | 1.47 in (2008) |
| December 28 | 71.1°F (1984) | -18.9°F (1924) | 2.46 in (2015) |
| December 29 | 64.9°F (1984) | -7.1°F (1917) | 1.47 in (1990) |
| December 30 | 64.0°F (1965) | -14.1°F (1983) | 1.41 in (1990) |
| December 31 | 63.0°F (1951) | -11.0°F (1976) | 2.26 in (2018) |