Weather on December 21
Naperville, IL
55 Years of Data
Avg High
35°F
Avg Low
18°F
Warmest
2006
44°F avg
Coldest
1989
-6°F avg
About This Date
December 21st in Naperville, IL typically brings cold winter weather, with average highs around 35°F and lows near 18°F. Over 55 years of records, the warmest December 21st was in 2006 (44°F average), while the coldest was 1989 (-6°F) — a 50°F range across recorded history. Precipitation has occurred on 29% of recorded December 21st dates, with snow falling 20% of the time (heaviest snowfall: 5.5"). The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Naperville, IL? Bundle up with warm layers and protect extremities from the cold. Check road conditions if traveling, as snow is possible.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 39° | 14° | 27° | — | — |
| 2024 | 30° | 14° | 22° | — | — |
| 2023 | 42° | 25° | 33° | — | — |
| 2022 | 31° | 10° | 20° | — | — |
| 2021 | 42° | 20° | 31° | — | — |
| 2020 | 41° | 31° | 36° | — | — |
| 2019 | 40° | 17° | 28° | — | — |
| 2018 | 46° | 33° | 40° | 0.25" | — |
| 2017 | 37° | 27° | 32° | — | — |
| 2016 | 29° | 17° | 23° | — | — |
| 2015 | 51° | 32° | 42° | 1.7" | — |
| 2014 | 33° | 28° | 31° | — | — |
| 2013 | 34° | 29° | 31° | — | — |
| 2012 | 49° | 26° | 37° | 1.07" | 0.2" |
| 2011 | 39° | 36° | 37° | 0.03" | — |
| 2010 | 29° | 10° | 19° | 0.64" | 3.4" |
| 2009 | 30° | 25° | 27° | — | 0.2" |
| 2008 | 31° | -7° | 12° | 0.25" | 0.5" |
| 2007 | 40° | 27° | 33° | 0.38" | — |
| 2006warmest | 51° | 37° | 44° | 1.02" | — |
| 2005 | 22° | 5° | 13° | — | — |
| 2004 | 33° | 25° | 29° | — | — |
| 2003 | 47° | 23° | 35° | — | — |
| 2002 | 36° | 29° | 32° | 0.05" | — |
| 2001 | 45° | 19° | 32° | — | — |
| 2000 | 20° | 3° | 11° | 0.41" | 3" |
| 1999 | 18° | 0° | 9° | — | — |
| 1998 | 37° | 19° | 28° | — | — |
| 1997 | 39° | 25° | 32° | — | — |
| 1996 | 37° | 13° | 25° | — | — |
| 1995 | 33° | 11° | 22° | — | — |
| 1994 | 48° | 24° | 36° | — | — |
| 1993 | 33° | 24° | 29° | — | — |
| 1992 | 32° | 15° | 24° | — | — |
| 1991 | 34° | 27° | 30° | — | — |
| 1990 | 36° | 28° | 32° | — | — |
| 1989coldest | 2° | -15° | -6° | 0.15" | 0.3" |
| 1988 | 39° | 28° | 34° | — | — |
| 1987 | 40° | 23° | 31° | — | — |
| 1986 | 43° | 22° | 32° | — | — |
| 1985 | 20° | -3° | 9° | — | — |
| 1984 | 52° | 25° | 38° | — | — |
| 1983 | 25° | 15° | 20° | 0.46" | 2" |
| 1982 | 35° | 14° | 25° | — | — |
| 1981 | 33° | 12° | 23° | 0.58" | 2.4" |
| 1980 | 22° | 0° | 11° | — | — |
| 1979 | 44° | 25° | 34° | — | — |
| 1978 | 30° | 13° | 21° | 0.79" | — |
| 1977 | 31° | 17° | 24° | 1.98" | 5.5" |
| 1976 | 17° | 1° | 9° | — | 0.2" |
| 1975 | 34° | 12° | 23° | — | — |
| 1974 | 34° | 28° | 31° | 0.51" | 2.5" |
| 1973 | 24° | -1° | 12° | — | — |
| 1972 | 35° | 32° | 34° | — | — |
| 1971 | 37° | 25° | 31° | — | — |
55 years of data from WHEATON 3 SE