Weather on December 20
Joliet, IL
55 Years of Data
Avg High
34°F
Avg Low
19°F
Warmest
1988
42°F avg
Coldest
1983
-3°F avg
About This Date
December 20th 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 20th was in 1988 (42°F average), while the coldest was 1983 (-3°F) — a 45°F range across recorded history. Precipitation has occurred on 19% of recorded December 20th dates, with snow falling 4% of the time. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Joliet, IL? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 43° | 22° | 33° | — | — |
| 2024 | 33° | 25° | 29° | 0.18" | 0.5" |
| 2023 | 33° | 16° | 24° | — | — |
| 2022 | 24° | 9° | 16° | — | — |
| 2021 | 37° | 26° | 32° | — | — |
| 2020 | 44° | — | — | — | — |
| 2019 | 34° | 15° | 24° | — | — |
| 2018 | 49° | 34° | 41° | — | — |
| 2017 | 49° | 28° | 38° | — | — |
| 2016 | 18° | -10° | 4° | — | — |
| 2015 | 34° | 17° | 25° | — | — |
| 2014 | 33° | 26° | 30° | — | — |
| 2013 | 42° | 35° | 39° | 0.25" | — |
| 2012 | 43° | 32° | 37° | 2.16" | — |
| 2011 | 51° | — | — | — | — |
| 2010 | 17° | 7° | 12° | — | — |
| 2009 | 40° | 29° | 34° | — | — |
| 2008 | 32° | 26° | 29° | — | — |
| 2007 | 30° | 17° | 24° | — | — |
| 2006 | 42° | 24° | 33° | — | — |
| 2005 | 10° | -3° | 4° | — | — |
| 2004 | 41° | 5° | 23° | — | — |
| 2003 | 31° | 12° | 21° | — | — |
| 2002 | 43° | 32° | 37° | — | — |
| 2001 | 39° | 28° | 34° | — | — |
| 2000 | 17° | -1° | 8° | — | — |
| 1999 | 37° | 24° | 31° | 0.08" | — |
| 1998 | 39° | 31° | 35° | — | — |
| 1997 | 50° | 31° | 40° | — | — |
| 1996 | 12° | 2° | 7° | — | — |
| 1995 | 34° | 19° | 26° | — | — |
| 1994 | 35° | 27° | 31° | — | — |
| 1993 | 37° | 33° | 35° | — | — |
| 1992 | 39° | 13° | 26° | 0.46" | — |
| 1991 | 32° | 14° | 23° | — | — |
| 1990 | 35° | 30° | 33° | — | — |
| 1989 | 12° | -6° | 3° | — | — |
| 1988warmest | 55° | 28° | 42° | — | — |
| 1987 | 40° | 32° | 36° | 2.82" | — |
| 1986 | 45° | 28° | 36° | — | — |
| 1985 | 17° | -8° | 5° | 0.05" | — |
| 1984 | 32° | 21° | 27° | — | — |
| 1983coldest | 7° | -13° | -3° | — | 0.3" |
| 1982 | 39° | 22° | 30° | 0.1" | — |
| 1981 | 22° | 0° | 11° | — | — |
| 1980 | 9° | -2° | 3° | — | — |
| 1979 | 45° | 25° | 35° | — | — |
| 1978 | 35° | 28° | 32° | 0.08" | — |
| 1977 | 42° | 29° | 35° | 1.4" | — |
| 1976 | 50° | 24° | 37° | — | — |
| 1975 | 38° | 23° | 30° | — | — |
| 1973 | 25° | 12° | 18° | — | — |
| 1972 | 36° | 33° | 34° | — | — |
| 1971 | 38° | 34° | 36° | — | — |
54 years of data from JOLIET