December weather in River Forest, IN
The average temperature in River Forest in December is 32.7°F (26.0°F–39.4°F). Average precipitation: 3.04 inches. Average snowfall is 5.0 inches.
December is a winter month in River Forest, and is cooler than the annual average of 52.6°F. Daily temperatures swing about 13.4°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 10m. For travel, December is cold.
Avg High
39.4°F
Avg Low
26.0°F
Precipitation
3.04 in
Snow
5.0 in
December records in River Forest
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (1982) | 5.0°F (1964) | 1.28 in (2006) |
| December 2 | 75.0°F (1982) | 3.0°F (1942) | 0.86 in (1905) |
| December 3 | 68.0°F (2012) | -2.0°F (1929) | 2.20 in (1967) |
| December 4 | 70.0°F (1998) | 3.0°F (1966) | 1.52 in (1951) |
| December 5 | 68.0°F (2001) | 7.0°F (2025) | 2.00 in (2007) |
| December 6 | 72.0°F (1998) | -4.0°F (1977) | 0.97 in (1953) |
| December 7 | 68.0°F (1946) | -2.0°F (1977) | 2.07 in (1956) |
| December 8 | 64.9°F (1946) | 0.0°F (1909) | 1.07 in (1966) |
| December 9 | 66.9°F (1897) | -9.0°F (1917) | 1.61 in (1966) |
| December 10 | 64.9°F (1971) | -11.9°F (1958) | 1.28 in (1985) |
| December 11 | 64.9°F (1931) | -13.0°F (1917) | 1.59 in (1985) |
| December 12 | 68.0°F (2015) | -11.0°F (1917) | 1.37 in (1940) |
| December 13 | 63.0°F (1927) | -9.0°F (1960) | 1.55 in (1923) |
| December 14 | 66.9°F (1975) | -6.0°F (2025) | 1.87 in (1971) |
| December 15 | 66.9°F (1933) | -11.0°F (1901) | 1.22 in (1975) |
| December 16 | 64.9°F (1924) | -11.9°F (1951) | 0.80 in (2016) |
| December 17 | 62.1°F (1924) | -9.0°F (1914) | 1.93 in (1937) |
| December 18 | 61.0°F (1908) | -6.0°F (1922) | 2.30 in (1924) |
| December 19 | 60.1°F (1918) | -8.0°F (1963) | 1.35 in (2008) |
| December 20 | 63.0°F (1949) | -11.0°F (1963) | 0.71 in (1923) |
| December 21 | 63.0°F (1949) | -18.9°F (1989) | 2.58 in (2013) |
| December 22 | 64.0°F (1967) | -22.0°F (1989) | 1.50 in (1981) |
| December 23 | 64.0°F (2015) | -11.0°F (1989) | 2.70 in (1924) |
| December 24 | 63.0°F (1932) | -17.0°F (1983) | 0.97 in (1921) |
| December 25 | 64.0°F (1982) | -14.1°F (1983) | 1.46 in (1964) |
| December 26 | 63.0°F (2016) | -6.0°F (1903) | 0.98 in (1895) |
| December 27 | 64.9°F (2008) | -8.0°F (1925) | 1.85 in (2015) |
| December 28 | 63.0°F (1984) | -15.0°F (1924) | 1.46 in (1968) |
| December 29 | 64.9°F (2025) | -7.1°F (1983) | 1.96 in (1990) |
| December 30 | 60.1°F (1936) | -11.0°F (1909) | 1.30 in (1932) |
| December 31 | 68.0°F (1951) | -11.0°F (1976) | 1.52 in (2006) |