Weather on May 21
Rockford, IL
55 Years of Data
Avg High
73°F
Avg Low
50°F
Warmest
2024
77°F avg
Coldest
2002
44°F avg
About This Date
May 21st in Rockford, IL typically brings pleasant spring weather, with average highs around 73°F and lows near 50°F. Over 55 years of records, the warmest May 21st was in 2024 (77°F average), while the coldest was 2002 (44°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 21st dates historically, with the wettest May 21st recording 1.68" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Rockford, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 52° | 47° | 49° | 0.28" | — |
| 2024warmest | 90° | 64° | 77° | 0.05" | — |
| 2023 | 81° | 44° | 62° | — | — |
| 2022 | 62° | 53° | 58° | 0.13" | — |
| 2021 | 77° | 66° | 72° | 0.15" | — |
| 2020 | 68° | 56° | 62° | — | — |
| 2019 | 56° | 47° | 51° | 1.68" | — |
| 2018 | 62° | 50° | 56° | 1.5" | — |
| 2017 | 63° | 50° | 56° | — | — |
| 2016 | 80° | 50° | 65° | — | — |
| 2015 | 69° | 40° | 54° | — | — |
| 2014 | 86° | 63° | 74° | — | — |
| 2013 | 80° | 60° | 70° | — | — |
| 2012 | 74° | 51° | 62° | — | — |
| 2011 | 79° | 58° | 68° | 0.05" | — |
| 2010 | 71° | 56° | 63° | 0.41" | — |
| 2009 | 86° | 56° | 71° | — | — |
| 2008 | 67° | 39° | 53° | — | — |
| 2007 | 87° | 44° | 66° | — | — |
| 2006 | 64° | 46° | 55° | — | — |
| 2005 | 71° | 45° | 58° | 0.03" | — |
| 2004 | 74° | 48° | 61° | 1.5" | — |
| 2003 | 61° | 42° | 51° | — | — |
| 2002coldest | 59° | 29° | 44° | — | — |
| 2001 | 68° | 51° | 60° | 1.3" | — |
| 2000 | 68° | 42° | 55° | — | — |
| 1999 | 73° | 56° | 64° | 0.74" | — |
| 1998 | 77° | 50° | 64° | — | — |
| 1997 | 62° | 35° | 49° | — | — |
| 1996 | 75° | 49° | 62° | — | — |
| 1995 | 71° | 46° | 59° | — | — |
| 1994 | 88° | 50° | 69° | — | — |
| 1993 | 69° | 38° | 53° | — | — |
| 1992 | 89° | 61° | 75° | — | — |
| 1991 | 82° | 59° | 71° | 0.56" | — |
| 1990 | 59° | 47° | 53° | — | — |
| 1989 | 79° | 46° | 62° | — | — |
| 1988 | 86° | 51° | 69° | — | — |
| 1987 | 87° | 63° | 75° | 0.03" | — |
| 1986 | 68° | 47° | 57° | — | — |
| 1985 | 70° | 44° | 57° | — | — |
| 1984 | 75° | 53° | 64° | — | — |
| 1983 | 72° | 54° | 63° | 1.5" | — |
| 1982 | 58° | 44° | 51° | 0.91" | — |
| 1981 | 80° | 41° | 61° | — | — |
| 1980 | 82° | 44° | 63° | — | — |
| 1979 | 63° | 41° | 52° | — | — |
| 1978 | 67° | 42° | 54° | — | — |
| 1977 | 88° | 63° | 75° | 0.1" | — |
| 1976 | 74° | 49° | 61° | — | — |
| 1975 | 74° | 63° | 68° | 0.64" | — |
| 1974 | 85° | 65° | 75° | 1.5" | — |
| 1973 | 70° | 48° | 59° | 0.18" | — |
| 1972 | 90° | 60° | 75° | — | — |
| 1971 | 69° | 42° | 56° | — | — |
55 years of data from ROCKFORD GTR ROCKFORD AP