Weather on December 18
Rockford, IL
55 Years of Data
Avg High
31°F
Avg Low
16°F
Warmest
2002
45°F avg
Coldest
1983
-8°F avg
About This Date
December 18th in Rockford, IL typically brings very cold winter weather, with average highs around 31°F and lows near 16°F. Over 55 years of records, the warmest December 18th was in 2002 (45°F average), while the coldest was 1983 (-8°F) — a 53°F range across recorded history. Precipitation has occurred on 22% of recorded December 18th dates, with snow falling 24% of the time (heaviest snowfall: 2.4"). The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Rockford, IL? Bundle up with warm layers and protect extremities from the cold. Check road conditions if traveling, as snow is possible.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 45° | 15° | 30° | 0.56" | — |
| 2024 | 33° | 24° | 29° | 0.2" | 1.9" |
| 2023 | 34° | 16° | 25° | — | — |
| 2022 | 19° | 10° | 15° | — | 0.1" |
| 2021 | 38° | 30° | 34° | — | 0.1" |
| 2020 | 40° | 19° | 30° | — | — |
| 2019 | 24° | 9° | 17° | — | — |
| 2018 | 43° | 21° | 32° | — | — |
| 2017 | 43° | 33° | 38° | 0.03" | — |
| 2016 | 13° | -11° | 1° | 0.05" | 0.3" |
| 2015 | 34° | 18° | 26° | — | 0.3" |
| 2014 | 28° | 18° | 23° | — | — |
| 2013 | 32° | 11° | 22° | — | — |
| 2012 | 39° | 30° | 35° | — | — |
| 2011 | 42° | 17° | 30° | — | — |
| 2010 | 18° | 9° | 13° | — | — |
| 2009 | 35° | 27° | 31° | — | — |
| 2008 | 20° | 1° | 10° | 0.28" | 0.9" |
| 2007 | 34° | 17° | 25° | — | — |
| 2006 | 39° | 24° | 32° | — | — |
| 2005 | 11° | 0° | 5° | — | — |
| 2004 | 37° | 13° | 25° | — | — |
| 2003 | 29° | 21° | 25° | — | — |
| 2002warmest | 54° | 37° | 45° | 1.6" | — |
| 2001 | 48° | 26° | 37° | — | — |
| 2000 | 9° | -4° | 2° | 0.33" | 2.4" |
| 1999 | 22° | 0° | 11° | — | — |
| 1998 | 50° | 31° | 40° | — | — |
| 1997 | 41° | 28° | 35° | — | — |
| 1996 | 16° | 3° | 9° | — | — |
| 1995 | 34° | 31° | 32° | — | — |
| 1994 | 32° | 14° | 23° | — | — |
| 1993 | 39° | 33° | 36° | 0.94" | 1.4" |
| 1992 | 33° | 21° | 27° | — | — |
| 1991 | 20° | 7° | 13° | — | — |
| 1990 | 33° | 27° | 30° | — | — |
| 1989 | 12° | -3° | 5° | 0.05" | 0.4" |
| 1988 | 34° | 12° | 23° | — | — |
| 1987 | 30° | 7° | 18° | — | — |
| 1986 | 33° | 25° | 29° | — | — |
| 1985 | 6° | -10° | -2° | — | — |
| 1984 | 29° | 14° | 21° | — | — |
| 1983coldest | 0° | -17° | -8° | — | 0.1" |
| 1982 | 43° | 30° | 36° | — | — |
| 1981 | 24° | 3° | 14° | — | — |
| 1980 | 34° | 12° | 23° | 0.2" | 1.5" |
| 1979 | 32° | 9° | 20° | — | — |
| 1978 | 39° | 27° | 33° | — | — |
| 1977 | 39° | 33° | 36° | — | — |
| 1976 | 40° | 16° | 28° | — | — |
| 1975 | 15° | -2° | 7° | — | — |
| 1974 | 28° | 17° | 23° | 0.23" | 1.4" |
| 1973 | 25° | 19° | 22° | 0.1" | 0.8" |
| 1972 | 37° | 27° | 32° | — | — |
| 1971 | 29° | 8° | 18° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP