Weather on December 18
Naperville, IL
55 Years of Data
Avg High
34°F
Avg Low
18°F
Warmest
2002
44°F avg
Coldest
1985
1°F avg
About This Date
December 18th in Naperville, IL typically brings cold winter weather, with average highs around 34°F and lows near 18°F. Over 55 years of records, the warmest December 18th was in 2002 (44°F average), while the coldest was 1985 (1°F) — a 43°F range across recorded history. Precipitation has occurred on 18% of recorded December 18th dates, with snow falling 11% of the time (heaviest snowfall: 3"). The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Naperville, IL? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 45° | 31° | 38° | 0.03" | — |
| 2024 | 35° | 29° | 32° | — | — |
| 2023 | 41° | 28° | 35° | — | — |
| 2022 | 22° | 12° | 17° | — | — |
| 2021 | 39° | 21° | 30° | — | — |
| 2020 | 35° | 19° | 27° | — | — |
| 2019 | 29° | 12° | 20° | — | — |
| 2018 | 44° | 19° | 32° | — | — |
| 2017 | 43° | 32° | 37° | — | — |
| 2016 | 22° | 4° | 13° | 0.71" | 3" |
| 2015 | 36° | 26° | 31° | — | — |
| 2014 | 26° | 22° | 24° | — | — |
| 2013 | 33° | — | — | 0.03" | 0.4" |
| 2012 | 40° | 28° | 34° | — | — |
| 2011 | 32° | 22° | 27° | — | — |
| 2010 | 29° | 9° | 19° | — | — |
| 2009 | 35° | 21° | 28° | — | — |
| 2008 | 19° | 1° | 10° | — | — |
| 2007 | 24° | 16° | 20° | — | — |
| 2006 | 48° | 30° | 39° | — | — |
| 2005 | 20° | 6° | 13° | — | — |
| 2004 | 39° | 27° | 33° | — | — |
| 2003 | 26° | 12° | 19° | — | — |
| 2002warmest | 55° | 33° | 44° | 0.97" | — |
| 2001 | 50° | 28° | 39° | — | — |
| 2000 | 16° | -2° | 7° | — | — |
| 1999 | 37° | 7° | 22° | 0.18" | 2" |
| 1998 | 53° | 24° | 39° | — | — |
| 1997 | 48° | 29° | 38° | — | — |
| 1996 | 25° | 10° | 17° | — | — |
| 1995 | 34° | 30° | 32° | — | — |
| 1994 | 44° | 29° | 36° | — | — |
| 1993 | 41° | 34° | 37° | 0.89" | — |
| 1992 | 32° | 25° | 28° | — | — |
| 1991 | 36° | 14° | 25° | — | — |
| 1990 | 44° | 28° | 36° | 0.43" | — |
| 1989 | 18° | 0° | 9° | — | — |
| 1988 | 36° | 5° | 20° | — | — |
| 1987 | 29° | 10° | 19° | — | — |
| 1986 | 40° | 30° | 35° | — | — |
| 1985coldest | 11° | -9° | 1° | 0.03" | 0.2" |
| 1984 | 35° | 17° | 26° | — | — |
| 1983 | 10° | -3° | 4° | 0.08" | 0.6" |
| 1982 | 43° | 30° | 36° | — | — |
| 1981 | 26° | 6° | 16° | 0.13" | 1.2" |
| 1980 | 36° | 25° | 30° | — | — |
| 1979 | 32° | 12° | 22° | — | — |
| 1978 | 43° | 23° | 33° | — | — |
| 1977 | 52° | 33° | 42° | — | — |
| 1976 | 47° | 13° | 30° | — | — |
| 1975 | 13° | 0° | 6° | — | — |
| 1974 | 30° | 15° | 23° | — | — |
| 1973 | 25° | 17° | 21° | — | — |
| 1972 | 36° | 16° | 26° | — | — |
| 1971 | 28° | 7° | 17° | — | — |
55 years of data from WHEATON 3 SE