Weather on December 21
Joliet, IL
55 Years of Data
Avg High
34°F
Avg Low
19°F
Warmest
2006
44°F avg
Coldest
1989
-4°F avg
About This Date
December 21st in Joliet, IL typically brings cold winter weather, with average highs around 34°F and lows near 19°F. Over 54 years of records, the warmest December 21st was in 2006 (44°F average), while the coldest was 1989 (-4°F) — a 48°F range across recorded history. Precipitation has occurred on 39% of recorded December 21st dates, with snow falling 9% of the time (heaviest snowfall: 3"). The last decade has been 7.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 7.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Joliet, IL? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
Warming Trend
2.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 35° | 19° | 27° | — | — |
| 2024 | 34° | 15° | 24° | — | — |
| 2023 | 44° | 28° | 36° | — | — |
| 2022 | 31° | 16° | 23° | — | — |
| 2021 | 44° | 26° | 35° | — | — |
| 2020 | 41° | 31° | 36° | — | — |
| 2019 | 38° | 21° | 29° | — | — |
| 2018 | 47° | 34° | 40° | 0.3" | — |
| 2017 | 39° | 31° | 35° | — | — |
| 2016 | 29° | 16° | 22° | — | — |
| 2015 | 47° | 34° | 40° | 1.27" | — |
| 2014 | 33° | 26° | 30° | — | — |
| 2013 | 35° | 29° | 32° | 0.41" | — |
| 2012 | 49° | 25° | 37° | 0.25" | 0.2" |
| 2011 | 40° | 36° | 38° | 0.03" | — |
| 2010 | 30° | 11° | 20° | 0.76" | 3" |
| 2009 | 30° | 26° | 28° | 0.08" | — |
| 2008 | 26° | -6° | 10° | 0.18" | 0.8" |
| 2007 | 38° | 26° | 32° | 0.38" | — |
| 2006warmest | 51° | 37° | 44° | 1.45" | — |
| 2005 | 21° | 9° | 15° | — | — |
| 2004 | 32° | 14° | 23° | — | — |
| 2003 | 33° | 12° | 23° | — | — |
| 2002 | 37° | 30° | 34° | 0.03" | — |
| 2001 | 33° | 23° | 28° | — | — |
| 2000 | 22° | -1° | 11° | 0.41" | 2" |
| 1999 | 24° | 4° | 14° | — | — |
| 1998 | 35° | 30° | 33° | 0.03" | — |
| 1997 | 35° | 29° | 32° | — | — |
| 1996 | 21° | 21° | 21° | — | — |
| 1995 | 29° | 18° | 23° | — | — |
| 1994 | 40° | 32° | 36° | — | — |
| 1993 | 36° | 25° | 30° | 0.03" | — |
| 1992 | 24° | 11° | 17° | — | — |
| 1991 | 35° | 30° | 33° | 0.69" | — |
| 1990 | 47° | 33° | 40° | — | — |
| 1989coldest | 5° | -13° | -4° | 0.13" | — |
| 1988 | 58° | 26° | 42° | — | — |
| 1987 | 38° | 27° | 32° | — | — |
| 1986 | 39° | 26° | 33° | — | — |
| 1985 | 18° | -4° | 7° | — | — |
| 1984 | 35° | 20° | 27° | 0.03" | — |
| 1983 | 22° | 3° | 12° | 0.2" | 0.3" |
| 1982 | 33° | 17° | 25° | — | — |
| 1981 | 30° | 2° | 16° | 0.53" | — |
| 1980 | 14° | -2° | 6° | — | — |
| 1979 | 44° | 27° | 35° | — | — |
| 1978 | 37° | 13° | 25° | 0.18" | — |
| 1977 | 33° | 15° | 24° | 0.38" | — |
| 1976 | 28° | 2° | 15° | — | — |
| 1975 | 32° | 22° | 27° | — | — |
| 1973 | 23° | -1° | 11° | — | — |
| 1972 | 39° | 20° | 29° | — | — |
| 1971 | 37° | 28° | 33° | — | — |
54 years of data from JOLIET