Weather on March 21
Chicago, IL
55 Years of Data
Avg High
49°F
Avg Low
33°F
Warmest
2012
71°F avg
Coldest
2013
24°F avg
About This Date
March 21st in Chicago, IL typically brings chilly spring weather, with average highs around 49°F and lows near 33°F. Over 53 years of records, the warmest March 21st was in 2012 (71°F average), while the coldest was 2013 (24°F) — a 47°F range across recorded history. Precipitation has occurred on 19% of recorded March 21st dates, with snow falling 4% of the time (heaviest snowfall: 6.5"). The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Chicago, IL? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 76° | 39° | 57° | — | — |
| 2025 | 58° | 33° | 45° | — | — |
| 2024 | 36° | 29° | 32° | — | — |
| 2023 | 54° | 37° | 45° | — | — |
| 2022 | 73° | 40° | 56° | — | — |
| 2021 | 65° | 40° | 52° | — | — |
| 2020 | 30° | 26° | 28° | — | — |
| 2019 | 46° | 37° | 42° | — | — |
| 2018 | 36° | 30° | 33° | — | — |
| 2017 | 49° | 32° | 40° | — | — |
| 2016 | 47° | 34° | 40° | — | — |
| 2015 | 46° | 33° | 40° | — | — |
| 2014 | 58° | 32° | 45° | — | — |
| 2013coldest | 32° | 16° | 24° | — | — |
| 2012warmest | 85° | 58° | 71° | — | — |
| 2011 | 61° | 40° | 50° | — | — |
| 2010 | 40° | 35° | 37° | — | — |
| 2009 | 60° | 37° | 49° | — | — |
| 2008 | 34° | 31° | 32° | — | — |
| 2007 | 70° | 36° | 53° | — | — |
| 2006 | 33° | 27° | 30° | — | — |
| 2005 | 39° | 27° | 33° | — | — |
| 2004 | 34° | 25° | 29° | — | — |
| 2003 | 52° | 39° | 45° | 0.05" | — |
| 2002 | 39° | 18° | 28° | — | — |
| 2001 | 54° | 31° | 42° | — | — |
| 2000 | 52° | 37° | 44° | 0.03" | — |
| 1999 | 48° | 33° | 41° | — | — |
| 1998 | 42° | 30° | 36° | — | — |
| 1994 | 59° | 42° | 51° | 0.2" | — |
| 1993 | 39° | 32° | 36° | 0.03" | — |
| 1992 | 39° | 28° | 34° | 0.05" | 0.1" |
| 1991 | 70° | 51° | 60° | — | — |
| 1990 | 55° | 35° | 45° | — | — |
| 1989 | 37° | 26° | 32° | — | — |
| 1988 | 35° | 24° | 30° | — | — |
| 1987 | 57° | 39° | 48° | — | — |
| 1986 | 35° | 18° | 26° | — | — |
| 1985 | 45° | 32° | 38° | — | — |
| 1984 | 42° | 32° | 37° | 0.08" | — |
| 1983 | 31° | 26° | 28° | 2.03" | 6.5" |
| 1982 | 40° | 33° | 36° | — | — |
| 1981 | 45° | 29° | 37° | — | — |
| 1980 | 58° | 35° | 46° | 0.41" | — |
| 1979 | 44° | 34° | 39° | — | — |
| 1978 | 51° | 38° | 44° | 0.61" | — |
| 1977 | 45° | 35° | 40° | 0.1" | — |
| 1976 | 48° | 29° | 38° | — | — |
| 1975 | 60° | 38° | 49° | — | — |
| 1974 | 37° | 25° | 31° | — | — |
| 1973 | 40° | 34° | 37° | — | — |
| 1972 | 63° | 42° | 52° | — | — |
| 1971 | 53° | 32° | 43° | — | — |
53 years of data from CHICAGO GRANT PARK