Weather on March 21
Rockford, IL
55 Years of Data
Avg High
49°F
Avg Low
29°F
Warmest
2012
73°F avg
Coldest
2013
19°F avg
About This Date
March 21st in Rockford, IL typically brings chilly spring weather, with average highs around 49°F and lows near 29°F. Over 56 years of records, the warmest March 21st was in 2012 (73°F average), while the coldest was 2013 (19°F) — a 54°F range across recorded history. Precipitation has occurred on 25% of recorded March 21st dates, with snow falling 14% of the time (heaviest snowfall: 8"). The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Rockford, IL? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 79° | 39° | 59° | — | — |
| 2025 | 60° | 28° | 44° | — | — |
| 2024 | 41° | 28° | 35° | — | — |
| 2023 | 56° | 34° | 45° | — | — |
| 2022 | 75° | 34° | 54° | — | — |
| 2021 | 67° | 31° | 49° | — | — |
| 2020 | 40° | 23° | 32° | — | — |
| 2019 | 50° | 37° | 44° | — | — |
| 2018 | 44° | 25° | 35° | — | — |
| 2017 | 54° | 30° | 42° | — | — |
| 2016 | 49° | 27° | 38° | — | — |
| 2015 | 57° | 31° | 44° | — | — |
| 2014 | 54° | 26° | 40° | — | — |
| 2013coldest | 29° | 10° | 19° | — | — |
| 2012warmest | 84° | 62° | 73° | — | — |
| 2011 | 60° | 43° | 51° | 0.28" | — |
| 2010 | 50° | 32° | 41° | — | — |
| 2009 | 63° | 36° | 49° | — | — |
| 2008 | 34° | 30° | 32° | 1.12" | 4.7" |
| 2007 | 66° | 39° | 53° | 2.67" | — |
| 2006 | 34° | 21° | 27° | — | — |
| 2005 | 42° | 22° | 32° | — | — |
| 2004 | 38° | 22° | 30° | — | — |
| 2003 | 46° | 36° | 41° | — | — |
| 2002 | 40° | 14° | 27° | 0.08" | 0.3" |
| 2001 | 55° | 27° | 41° | — | — |
| 2000 | 52° | 43° | 47° | — | — |
| 1999 | 48° | 30° | 39° | — | — |
| 1998 | 46° | 27° | 36° | — | — |
| 1997 | 68° | 38° | 53° | — | — |
| 1996 | 38° | 20° | 29° | — | — |
| 1995 | 51° | 28° | 40° | — | — |
| 1994 | 55° | 34° | 44° | 1.09" | — |
| 1993 | 38° | 31° | 34° | 0.79" | 3.2" |
| 1992 | 31° | 22° | 26° | 1.83" | 8" |
| 1991 | 71° | 43° | 57° | 0.1" | — |
| 1990 | 64° | 30° | 47° | — | — |
| 1989 | 33° | 19° | 26° | — | — |
| 1988 | 38° | 20° | 29° | — | — |
| 1987 | 60° | 26° | 43° | — | — |
| 1986 | 40° | 13° | 26° | — | — |
| 1985 | 53° | 26° | 40° | — | — |
| 1984 | 34° | 32° | 33° | 0.25" | 1" |
| 1983 | 28° | 18° | 23° | 0.25" | 1.1" |
| 1982 | 41° | 31° | 36° | — | — |
| 1981 | 51° | 19° | 35° | — | — |
| 1980 | 43° | 26° | 34° | — | — |
| 1979 | 41° | 31° | 36° | — | — |
| 1978 | 45° | 33° | 39° | — | — |
| 1977 | 36° | 29° | 32° | 0.66" | 4.2" |
| 1976 | 43° | 21° | 32° | — | — |
| 1975 | 61° | 39° | 50° | 0.81" | — |
| 1974 | 37° | 19° | 28° | 0.03" | 0.1" |
| 1973 | 45° | 26° | 35° | — | — |
| 1972 | 60° | 40° | 50° | 0.61" | — |
| 1971 | 41° | 28° | 35° | — | — |
56 years of data from ROCKFORD GTR ROCKFORD AP