December weather in Casey, IL
The average temperature in Casey in December is 33.2°F (24.3°F–42.1°F). Average precipitation: 3.06 inches. Average snowfall is 3.2 inches.
December is a winter month in Casey, and is cooler than the annual average of 54.1°F. Daily temperatures swing about 17.8°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 15m. For travel, December is cold.
Avg High
42.1°F
Avg Low
24.3°F
Precipitation
3.06 in
Snow
3.2 in
December records in Casey
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (2014) | 9.0°F (1893) | 1.45 in (1894) |
| December 2 | 72.0°F (1982) | 10.0°F (1908) | 1.04 in (1982) |
| December 3 | 70.0°F (1982) | 7.0°F (1985) | 1.07 in (1982) |
| December 4 | 66.0°F (2021) | 10.0°F (1985) | 1.90 in (1920) |
| December 5 | 66.9°F (2017) | 3.0°F (2025) | 1.00 in (1909) |
| December 6 | 66.0°F (1980) | 3.9°F (1984) | 2.00 in (1906) |
| December 7 | 62.1°F (1980) | 3.9°F (1909) | 1.46 in (1922) |
| December 8 | 59.0°F (1894) | -2.0°F (1909) | 1.00 in (1956) |
| December 9 | 64.9°F (1897) | -6.0°F (1909) | 1.52 in (1893) |
| December 10 | 66.9°F (1897) | -0.9°F (1909) | 0.92 in (1983) |
| December 11 | 66.9°F (2021) | 1.0°F (1903) | 1.77 in (1931) |
| December 12 | 62.1°F (2020) | 6.1°F (1989) | 2.00 in (1918) |
| December 13 | 70.0°F (2015) | -6.0°F (1903) | 3.13 in (1901) |
| December 14 | 69.1°F (1984) | -7.1°F (2025) | 1.50 in (1906) |
| December 15 | 61.0°F (1893) | -9.9°F (2025) | 2.34 in (1987) |
| December 16 | 64.0°F (1984) | -9.0°F (1989) | 0.53 in (1937) |
| December 17 | 64.9°F (1908) | -8.0°F (1989) | 1.78 in (1929) |
| December 18 | 55.0°F (1895) | -7.1°F (1985) | 3.29 in (1924) |
| December 19 | 60.1°F (1895) | -9.9°F (1983) | 1.11 in (1995) |
| December 20 | 59.0°F (1988) | -6.0°F (1981) | 1.60 in (1957) |
| December 21 | 62.1°F (1988) | -7.1°F (1985) | 1.28 in (2006) |
| December 22 | 59.0°F (1893) | -20.9°F (1989) | 1.49 in (2013) |
| December 23 | 62.1°F (2015) | -20.9°F (1989) | 1.58 in (1988) |
| December 24 | 64.9°F (2025) | -17.0°F (1989) | 1.58 in (1982) |
| December 25 | 66.0°F (2023) | -11.9°F (1983) | 1.26 in (2009) |
| December 26 | 68.0°F (2021) | -2.0°F (1903) | 0.80 in (1949) |
| December 27 | 68.0°F (2019) | -2.0°F (2017) | 2.70 in (2015) |
| December 28 | 68.0°F (2025) | -5.1°F (1909) | 1.54 in (2015) |
| December 29 | 66.9°F (2025) | -7.1°F (1909) | 1.42 in (2021) |
| December 30 | 60.1°F (1906) | -9.9°F (1909) | 2.98 in (1990) |
| December 31 | 60.1°F (1896) | 1.9°F (1895) | 1.02 in (1984) |