December weather in Round Lake Heights, IL
The average temperature in Round Lake Heights in December is 27.9°F (20.8°F–35.0°F). Average precipitation: 2.28 inches. Average snowfall is 9.2 inches.
December is a winter month in Round Lake Heights, and is cooler than the annual average of 48.6°F. Daily temperatures swing about 14.2°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 8h 55m. For travel, December is cold.
Avg High
35.0°F
Avg Low
20.8°F
Precipitation
2.28 in
Snow
9.2 in
December records in Round Lake Heights
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 55.9°F (1998) | 12.0°F (2002) | 1.27 in (1985) |
| December 2 | 61.0°F (1998) | 12.0°F (1988) | 0.92 in (1991) |
| December 3 | 64.9°F (1998) | 10.9°F (1989) | 1.03 in (1990) |
| December 4 | 63.0°F (1998) | 1.0°F (1991) | 0.61 in (1999) |
| December 5 | 66.9°F (2001) | -0.9°F (2005) | 0.55 in (1999) |
| December 6 | 57.9°F (1998) | -0.9°F (2005) | 0.89 in (1994) |
| December 7 | 48.0°F (2004) | -5.1°F (2005) | 0.88 in (1987) |
| December 8 | 55.9°F (1991) | 0.0°F (1995) | 0.33 in (2005) |
| December 9 | 53.1°F (1987) | -7.1°F (1995) | 0.96 in (2003) |
| December 10 | 50.0°F (2001) | -2.9°F (1995) | 0.84 in (2003) |
| December 11 | 53.1°F (1990) | -2.0°F (1995) | 0.93 in (2000) |
| December 12 | 59.0°F (1991) | -5.1°F (2000) | 0.56 in (2001) |
| December 13 | 51.1°F (1998) | -8.0°F (2000) | 0.35 in (2000) |
| December 14 | 48.9°F (1998) | -6.0°F (1989) | 0.17 in (2005) |
| December 15 | 51.1°F (1992) | -11.9°F (1989) | 1.48 in (1987) |
| December 16 | 44.1°F (1997) | -7.1°F (1989) | 0.19 in (1994) |
| December 17 | 48.9°F (1997) | -2.9°F (2000) | 0.21 in (1990) |
| December 18 | 54.0°F (2002) | -2.9°F (2000) | 0.62 in (2002) |
| December 19 | 53.1°F (2002) | -4.0°F (2005) | 0.86 in (1987) |
| December 20 | 53.1°F (1988) | -11.0°F (1989) | 0.28 in (1991) |
| December 21 | 50.0°F (1994) | -18.0°F (1989) | 0.08 in (2000) |
| December 22 | 48.0°F (1994) | -14.1°F (1989) | 0.26 in (1988) |
| December 23 | 45.0°F (1988) | -13.0°F (1989) | 0.40 in (1996) |
| December 24 | 43.0°F (1987) | -6.0°F (2000) | 0.48 in (1997) |
| December 25 | 51.1°F (1994) | -8.0°F (2000) | 0.15 in (1996) |
| December 26 | 48.0°F (1994) | -8.0°F (1990) | 0.59 in (1988) |
| December 27 | 50.0°F (1994) | 1.0°F (2000) | 0.31 in (1988) |
| December 28 | 48.0°F (2003) | -2.9°F (1993) | 1.52 in (1987) |
| December 29 | 44.1°F (1999) | 1.9°F (1998) | 0.53 in (1992) |
| December 30 | 55.9°F (2002) | -4.0°F (1998) | 1.02 in (1992) |
| December 31 | 54.0°F (2004) | -2.0°F (1990) | 0.07 in (1997) |