Weather on December 18
Joliet, IL
55 Years of Data
Avg High
33°F
Avg Low
19°F
Warmest
2002
45°F avg
Coldest
1985
1°F avg
About This Date
December 18th in Joliet, IL typically brings cold winter weather, with average highs around 33°F and lows near 19°F. Over 54 years of records, the warmest December 18th was in 2002 (45°F average), while the coldest was 1985 (1°F) — a 44°F range across recorded history. Precipitation has occurred on 19% of recorded December 18th dates, with snow falling 4% of the time (heaviest snowfall: 3"). The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Joliet, IL? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 52° | 35° | 43° | 0.1" | — |
| 2024 | 36° | 31° | 33° | — | — |
| 2023 | 42° | 33° | 38° | — | — |
| 2022 | 24° | 13° | 18° | — | — |
| 2021 | 39° | 25° | 32° | 0.38" | — |
| 2020 | 34° | 22° | 28° | — | — |
| 2019 | 27° | 18° | 22° | — | — |
| 2018 | 41° | 24° | 33° | — | — |
| 2017 | 48° | 32° | 40° | — | — |
| 2016 | 23° | 7° | 15° | 0.51" | 3" |
| 2015 | 35° | 25° | 30° | — | — |
| 2014 | 27° | 23° | 25° | — | — |
| 2013 | 32° | 12° | 22° | — | — |
| 2012 | 39° | 31° | 35° | — | — |
| 2011 | 33° | 24° | 29° | — | — |
| 2010 | 20° | 9° | 14° | — | — |
| 2009 | 36° | 22° | 29° | — | — |
| 2008 | 16° | 8° | 12° | — | — |
| 2007 | 24° | 16° | 20° | — | — |
| 2006 | 49° | 36° | 42° | — | — |
| 2005 | 21° | 7° | 14° | — | — |
| 2004 | 35° | 21° | 28° | — | — |
| 2003 | 25° | 21° | 23° | — | — |
| 2002warmest | 61° | 30° | 45° | 0.33" | — |
| 2001 | 46° | 31° | 38° | — | — |
| 2000 | 7° | -1° | 3° | — | — |
| 1999 | 31° | 18° | 24° | 0.08" | — |
| 1998 | 38° | 26° | 32° | — | — |
| 1997 | 46° | 25° | 35° | — | — |
| 1996 | 28° | 15° | 22° | 0.1" | — |
| 1995 | 38° | 26° | 32° | — | — |
| 1994 | 46° | 32° | 39° | 0.03" | — |
| 1993 | 43° | 34° | 38° | 0.76" | — |
| 1992 | 32° | 27° | 29° | — | — |
| 1991 | 39° | 17° | 28° | — | — |
| 1990 | 40° | 34° | 37° | 0.51" | — |
| 1989 | 15° | 1° | 8° | — | — |
| 1988 | 22° | 12° | 17° | — | — |
| 1987 | 26° | 15° | 21° | — | — |
| 1986 | 42° | 30° | 36° | — | — |
| 1985coldest | 12° | -10° | 1° | — | — |
| 1984 | 50° | 19° | 35° | — | — |
| 1983 | 11° | 1° | 6° | 0.05" | 0.3" |
| 1982 | 38° | 22° | 30° | — | — |
| 1981 | 25° | 7° | 16° | — | — |
| 1980 | 39° | 24° | 32° | — | — |
| 1979 | 20° | -1° | 10° | — | — |
| 1978 | 37° | 18° | 27° | — | — |
| 1977 | 55° | 33° | 44° | — | — |
| 1976 | 39° | 25° | 32° | — | — |
| 1975 | 12° | 2° | 7° | — | — |
| 1973 | 30° | 10° | 20° | — | — |
| 1972 | 39° | 11° | 25° | — | — |
| 1971 | 30° | 10° | 20° | — | — |
54 years of data from JOLIET