Weather on March 21
Naperville, IL
55 Years of Data
Avg High
52°F
Avg Low
30°F
Warmest
2012
72°F avg
Coldest
2013
18°F avg
About This Date
March 21st in Naperville, IL typically brings cool spring weather, with average highs around 52°F and lows near 30°F. Over 56 years of records, the warmest March 21st was in 2012 (72°F average), while the coldest was 2013 (18°F) — a 54°F range across recorded history. Precipitation has occurred on 36% of recorded March 21st dates, with snow falling 9% of the time (heaviest snowfall: 6.4"). The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Naperville, IL? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 73° | 38° | 55° | — | — |
| 2025 | 44° | 24° | 34° | — | — |
| 2024 | 40° | 20° | 30° | — | — |
| 2023 | 51° | 28° | 40° | — | — |
| 2022 | 65° | 30° | 47° | — | — |
| 2021 | 57° | 21° | 39° | — | — |
| 2020 | 41° | 26° | 34° | — | — |
| 2019 | 45° | 37° | 41° | — | — |
| 2018 | 37° | 27° | 32° | — | — |
| 2017 | 52° | 29° | 40° | — | — |
| 2016 | 46° | 25° | 35° | — | — |
| 2015 | 51° | 35° | 43° | — | — |
| 2014 | 46° | 24° | 35° | — | — |
| 2013coldest | 25° | 11° | 18° | — | — |
| 2012warmest | 84° | 61° | 72° | — | — |
| 2011 | 60° | 42° | 51° | 1.14" | — |
| 2010 | 44° | 30° | 37° | — | — |
| 2009 | 46° | 19° | 33° | — | — |
| 2008 | 52° | 22° | 37° | 0.33" | 1.4" |
| 2007 | 68° | 38° | 53° | 0.89" | — |
| 2006 | 36° | 26° | 31° | — | — |
| 2005 | 41° | 20° | 30° | — | — |
| 2004 | 58° | 29° | 43° | — | — |
| 2003 | 63° | 38° | 50° | 0.13" | — |
| 2002 | 53° | 22° | 37° | 0.05" | — |
| 2001 | 57° | 24° | 41° | — | — |
| 2000 | 56° | 43° | 49° | 0.03" | — |
| 1999 | 55° | 32° | 44° | — | — |
| 1998 | 47° | 31° | 39° | — | — |
| 1997 | 73° | 39° | 56° | — | — |
| 1996 | 40° | 20° | 30° | — | — |
| 1995 | 53° | 33° | 43° | 0.36" | — |
| 1994 | 65° | 40° | 52° | 0.86" | — |
| 1993 | 40° | 29° | 34° | 0.05" | — |
| 1992 | 42° | 19° | 31° | — | — |
| 1991 | 72° | 47° | 59° | — | — |
| 1990 | 60° | 40° | 50° | — | — |
| 1989 | 37° | 20° | 28° | 0.15" | — |
| 1988 | 40° | 24° | 32° | — | — |
| 1987 | 64° | 27° | 45° | — | — |
| 1986 | 40° | 8° | 24° | 0.51" | 3" |
| 1985 | 54° | 49° | 51° | — | — |
| 1984 | 37° | 31° | 34° | 0.05" | — |
| 1983 | — | 25° | — | 1.32" | 6.4" |
| 1982 | 45° | 34° | 39° | — | — |
| 1981 | 52° | 18° | 35° | — | — |
| 1980 | 48° | 32° | 40° | — | — |
| 1979 | 52° | 28° | 40° | 0.97" | — |
| 1978 | 49° | 36° | 42° | 0.13" | — |
| 1977 | 42° | 31° | 36° | 0.05" | 0.1" |
| 1976 | 64° | 29° | 46° | 0.33" | — |
| 1975 | 72° | 42° | 57° | 0.2" | — |
| 1974 | 40° | 20° | 30° | 0.53" | 0.5" |
| 1973 | 47° | 24° | 35° | — | — |
| 1972 | 65° | 50° | 57° | 0.76" | — |
| 1971 | 51° | 23° | 37° | — | — |
56 years of data from LISLE - MORTON ARBORETUM