Weather on December 21
Rockford, IL
55 Years of Data
Avg High
32°F
Avg Low
17°F
Warmest
2015
45°F avg
Coldest
1989
-12°F avg
About This Date
December 21st in Rockford, IL typically brings cold winter weather, with average highs around 32°F and lows near 17°F. Over 55 years of records, the warmest December 21st was in 2015 (45°F average), while the coldest was 1989 (-12°F) — a 57°F range across recorded history. Precipitation has occurred on 29% of recorded December 21st dates, with snow falling 22% of the time (heaviest snowfall: 4.6"). The last decade has been 8.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 8.8°F warmer on this date compared to 20-30 years ago.
Planning for December 21st 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
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 31° | 12° | 21° | — | — |
| 2024 | 22° | 4° | 13° | — | — |
| 2023 | 43° | 33° | 38° | — | — |
| 2022 | 30° | 6° | 18° | — | — |
| 2021 | 39° | 18° | 29° | — | — |
| 2020 | 47° | 33° | 40° | — | — |
| 2019 | 48° | 24° | 36° | — | — |
| 2018 | 35° | 28° | 32° | — | — |
| 2017 | 39° | 26° | 33° | 0.15" | 0.1" |
| 2016 | 36° | 17° | 27° | — | — |
| 2015warmest | 50° | 40° | 45° | 1.6" | — |
| 2014 | 37° | 31° | 34° | — | 0.1" |
| 2013 | 33° | 25° | 29° | 0.05" | 0.1" |
| 2012 | 30° | 15° | 23° | — | — |
| 2011 | 39° | 32° | 36° | 0.08" | — |
| 2010 | 34° | 18° | 26° | 0.03" | — |
| 2009 | 27° | 24° | 25° | 0.1" | 0.5" |
| 2008 | 6° | -8° | -1° | — | — |
| 2007 | 36° | 34° | 35° | — | — |
| 2006 | 49° | 37° | 43° | 1.52" | — |
| 2005 | 15° | 0° | 8° | — | — |
| 2004 | 29° | 9° | 19° | 0.03" | 0.3" |
| 2003 | 49° | 25° | 37° | — | — |
| 2002 | 33° | 25° | 29° | — | — |
| 2001 | 39° | 19° | 29° | — | — |
| 2000 | 16° | -9° | 3° | 0.03" | 0.7" |
| 1999 | 11° | -3° | 4° | — | — |
| 1998 | 30° | 5° | 18° | — | — |
| 1997 | 35° | 18° | 26° | — | — |
| 1996 | 34° | 18° | 26° | — | — |
| 1995 | 29° | 18° | 23° | — | — |
| 1994 | 42° | 26° | 34° | — | — |
| 1993 | 27° | 21° | 24° | 0.03" | 0.3" |
| 1992 | 36° | 16° | 26° | — | — |
| 1991 | 34° | 25° | 29° | — | — |
| 1990 | 38° | 18° | 28° | 0.33" | 0.6" |
| 1989coldest | -6° | -18° | -12° | — | — |
| 1988 | 37° | 22° | 29° | — | — |
| 1987 | 36° | 21° | 28° | — | — |
| 1986 | 39° | 18° | 28° | — | — |
| 1985 | 17° | -8° | 5° | — | — |
| 1984 | 49° | 30° | 39° | 0.51" | — |
| 1983 | 22° | 15° | 18° | 0.76" | 4.6" |
| 1982 | 34° | 14° | 24° | — | — |
| 1981 | 33° | 23° | 28° | 0.18" | 0.7" |
| 1980 | 20° | 0° | 10° | — | — |
| 1979 | 42° | 27° | 34° | — | — |
| 1978 | 25° | 13° | 19° | — | — |
| 1977 | 28° | 19° | 24° | 0.2" | 1.2" |
| 1976 | 13° | -2° | 5° | — | — |
| 1975 | 32° | 14° | 23° | — | — |
| 1974 | 31° | 8° | 19° | 0.13" | 0.7" |
| 1973 | 16° | -8° | 4° | — | — |
| 1972 | 33° | 31° | 32° | — | — |
| 1971 | 36° | 23° | 29° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP