December weather in Sullivan, IN
The average temperature in Sullivan in December is 34.4°F (26.1°F–42.7°F). Average precipitation: 3.03 inches.
December is a winter month in Sullivan, and is cooler than the annual average of 54.4°F. Daily temperatures swing about 16.6°F between overnight low and afternoon high. Daylight averages about 9h 16m. For travel, December is cold.
Avg High
42.7°F
Avg Low
26.1°F
Precipitation
3.03 in
Daylight
9h 16m
December records in Sullivan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 62.1°F (1998) | 12.9°F (2002) | 1.74 in (2006) |
| December 2 | 64.0°F (1995) | 10.0°F (2024) | 0.77 in (2019) |
| December 3 | 63.0°F (1995) | 10.0°F (2024) | 0.91 in (2009) |
| December 4 | 71.1°F (2012) | 7.0°F (1991) | 0.96 in (1993) |
| December 5 | 70.0°F (1998) | 9.0°F (1991) | 0.91 in (1999) |
| December 6 | 69.1°F (2001) | 6.1°F (2002) | 1.75 in (2014) |
| December 7 | 73.0°F (1998) | 8.1°F (2013) | 0.34 in (1998) |
| December 8 | 59.0°F (2004) | 6.1°F (2006) | 0.97 in (2009) |
| December 9 | 63.0°F (1991) | -0.9°F (1995) | 1.00 in (2008) |
| December 10 | 64.9°F (2023) | -0.9°F (1995) | 1.20 in (1999) |
| December 11 | 64.9°F (2020) | 5.0°F (1995) | 0.33 in (1994) |
| December 12 | 64.0°F (1996) | -2.9°F (2013) | 0.89 in (2006) |
| December 13 | 69.1°F (2015) | -2.0°F (2013) | 0.60 in (2007) |
| December 14 | 66.9°F (2015) | -11.0°F (2025) | 1.09 in (2020) |
| December 15 | 63.0°F (1995) | -14.1°F (2025) | 1.24 in (2011) |
| December 16 | 60.1°F (2011) | -4.0°F (1989) | 0.64 in (2000) |
| December 17 | 60.1°F (2024) | -7.1°F (1989) | 1.22 in (2001) |
| December 18 | 61.0°F (2006) | -2.0°F (2000) | 1.20 in (1990) |
| December 19 | 57.9°F (2002) | 0.0°F (1996) | 1.36 in (2008) |
| December 20 | 57.0°F (1997) | -13.0°F (1989) | 0.86 in (1995) |
| December 21 | 60.1°F (2013) | -11.0°F (1989) | 2.25 in (2013) |
| December 22 | 57.9°F (1990) | -22.0°F (1989) | 1.91 in (2013) |
| December 23 | 61.0°F (2015) | -20.9°F (1989) | 0.92 in (2007) |
| December 24 | 63.0°F (2015) | -20.9°F (1989) | 0.86 in (1996) |
| December 25 | 66.0°F (2023) | -20.9°F (1989) | 0.66 in (2005) |
| December 26 | 66.0°F (2019) | -11.9°F (2000) | 0.65 in (2012) |
| December 27 | 68.0°F (2019) | -11.0°F (2004) | 1.94 in (2015) |
| December 28 | 70.0°F (2008) | -4.0°F (2000) | 1.11 in (2015) |
| December 29 | 62.1°F (1996) | 6.1°F (2000) | 1.19 in (2024) |
| December 30 | 61.0°F (2019) | 3.0°F (1993) | 2.45 in (2019) |
| December 31 | 62.1°F (2018) | 3.0°F (1993) | 0.65 in (1989) |