December weather in Shelbyville, IL
The average temperature in Shelbyville in December is 32.6°F (24.7°F–40.6°F). Average precipitation: 2.59 inches.
December is a winter month in Shelbyville, and is cooler than the annual average of 53.6°F. Daily temperatures swing about 15.9°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 14m. For travel, December is cold.
Avg High
40.6°F
Avg Low
24.7°F
Precipitation
2.59 in
Daylight
9h 14m
December records in Shelbyville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (1982) | 12.0°F (1976) | 1.52 in (2006) |
| December 2 | 70.0°F (1982) | 9.0°F (1985) | 0.84 in (1986) |
| December 3 | 70.0°F (2012) | 8.1°F (1985) | 1.36 in (1982) |
| December 4 | 69.1°F (1998) | 10.0°F (1976) | 0.93 in (1982) |
| December 5 | 64.9°F (2001) | 3.0°F (2025) | 0.88 in (1982) |
| December 6 | 66.0°F (2001) | 1.9°F (1977) | 0.95 in (2014) |
| December 7 | 72.0°F (1998) | 0.0°F (1977) | 1.65 in (2004) |
| December 8 | 59.0°F (2023) | 3.0°F (2005) | 0.79 in (1987) |
| December 9 | 59.0°F (2023) | -2.0°F (1977) | 0.79 in (2009) |
| December 10 | 62.1°F (1979) | -2.0°F (1977) | 0.62 in (1985) |
| December 11 | 64.0°F (1979) | 0.0°F (1977) | 2.72 in (1985) |
| December 12 | 63.0°F (1984) | 3.0°F (2013) | 1.42 in (2010) |
| December 13 | 68.0°F (2015) | 3.0°F (2013) | 0.67 in (2009) |
| December 14 | 66.0°F (2015) | -2.9°F (2025) | 0.68 in (1999) |
| December 15 | 59.0°F (2006) | -4.0°F (2025) | 1.77 in (1987) |
| December 16 | 66.0°F (1984) | 5.0°F (2025) | 0.79 in (2007) |
| December 17 | 62.1°F (1984) | 3.9°F (1979) | 1.27 in (2001) |
| December 18 | 57.9°F (2006) | -7.1°F (1985) | 0.42 in (2021) |
| December 19 | 57.9°F (1988) | -9.0°F (1983) | 1.18 in (2008) |
| December 20 | 66.9°F (1988) | -9.9°F (1981) | 0.94 in (2012) |
| December 21 | 63.0°F (2013) | -7.1°F (1985) | 0.90 in (2006) |
| December 22 | 60.1°F (1988) | -2.9°F (1983) | 1.12 in (2013) |
| December 23 | 59.0°F (2015) | -9.0°F (2022) | 1.20 in (1988) |
| December 24 | 63.0°F (2015) | -15.0°F (1983) | 1.32 in (1982) |
| December 25 | 64.9°F (1982) | -2.9°F (1985) | 1.58 in (2009) |
| December 26 | 64.0°F (2019) | -5.1°F (2000) | 0.34 in (2016) |
| December 27 | 68.0°F (2008) | 0.0°F (1983) | 4.48 in (2015) |
| December 28 | 70.0°F (1984) | -0.9°F (2017) | 1.71 in (2008) |
| December 29 | 70.0°F (2025) | -4.0°F (1983) | 1.20 in (1984) |
| December 30 | 59.0°F (2006) | -11.9°F (1983) | 0.57 in (2022) |
| December 31 | 64.0°F (1984) | -9.9°F (1983) | 1.25 in (2006) |