December weather in Pontiac, IL
The average temperature in Pontiac in December is 30.3°F (22.7°F–37.8°F). Average precipitation: 2.13 inches. Average snowfall is 5.7 inches.
December is a winter month in Pontiac, and is cooler than the annual average of 51.8°F. Daily temperatures swing about 15.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 5m. For travel, December is cold.
Avg High
37.8°F
Avg Low
22.7°F
Precipitation
2.13 in
Snow
5.7 in
December records in Pontiac
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (1970) | 10.0°F (1929) | 1.42 in (2006) |
| December 2 | 66.9°F (1962) | 0.0°F (1942) | 0.80 in (1986) |
| December 3 | 71.1°F (1982) | -4.0°F (1929) | 5.50 in (1982) |
| December 4 | 71.1°F (2012) | -0.9°F (1991) | 0.83 in (1947) |
| December 5 | 69.1°F (1998) | -0.9°F (1991) | 1.01 in (1924) |
| December 6 | 68.0°F (2001) | -2.0°F (1977) | 1.05 in (1932) |
| December 7 | 66.9°F (1916) | -5.1°F (2005) | 1.39 in (1998) |
| December 8 | 63.0°F (1946) | -5.1°F (2005) | 1.71 in (1966) |
| December 9 | 64.9°F (1918) | -14.1°F (1958) | 0.87 in (1907) |
| December 10 | 60.1°F (1911) | -14.1°F (1958) | 1.10 in (1971) |
| December 11 | 63.0°F (1949) | -9.9°F (1917) | 1.12 in (1983) |
| December 12 | 60.1°F (1949) | -8.0°F (1962) | 1.26 in (1946) |
| December 13 | 66.0°F (2015) | -11.9°F (1903) | 1.06 in (1927) |
| December 14 | 64.9°F (1975) | -6.0°F (1989) | 0.88 in (2011) |
| December 15 | 62.1°F (1971) | -14.1°F (1917) | 1.63 in (2011) |
| December 16 | 59.0°F (1918) | -14.1°F (1932) | 0.82 in (1992) |
| December 17 | 64.0°F (1984) | -9.9°F (1989) | 0.52 in (1924) |
| December 18 | 61.0°F (1962) | -11.0°F (1985) | 0.60 in (2002) |
| December 19 | 57.9°F (1918) | -15.0°F (1983) | 0.64 in (2008) |
| December 20 | 61.0°F (1949) | -15.0°F (1983) | 1.01 in (1987) |
| December 21 | 62.1°F (1967) | -16.1°F (1963) | 3.05 in (1949) |
| December 22 | 57.9°F (2015) | -20.0°F (1989) | 0.54 in (1990) |
| December 23 | 63.0°F (1933) | -20.0°F (1989) | 1.84 in (1932) |
| December 24 | 64.9°F (1982) | -18.9°F (1983) | 3.11 in (1965) |
| December 25 | 61.0°F (1982) | -18.0°F (1983) | 1.40 in (2009) |
| December 26 | 61.0°F (1982) | -18.9°F (1914) | 0.71 in (1936) |
| December 27 | 61.0°F (1907) | -7.1°F (1935) | 1.62 in (1942) |
| December 28 | 62.1°F (1982) | -23.1°F (1924) | 0.98 in (1968) |
| December 29 | 68.0°F (1984) | -11.9°F (1917) | 1.77 in (1990) |
| December 30 | 61.0°F (1936) | -13.0°F (1909) | 1.43 in (1971) |
| December 31 | 60.1°F (2002) | -9.9°F (1976) | 0.80 in (2010) |