Weather on December 20
Naperville, IL
55 Years of Data
Avg High
35°F
Avg Low
19°F
Warmest
2002
46°F avg
Coldest
1989
2°F avg
About This Date
December 20th in Naperville, IL typically brings cold winter weather, with average highs around 35°F and lows near 19°F. Over 55 years of records, the warmest December 20th was in 2002 (46°F average), while the coldest was 1989 (2°F) — a 44°F range across recorded history. Precipitation has occurred on 24% of recorded December 20th dates, with snow falling 13% of the time (heaviest snowfall: 2.8"). The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Naperville, 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 | 36° | 9° | 22° | — | — |
| 2024 | 33° | 22° | 27° | 0.66" | 2.8" |
| 2023 | 30° | 15° | 23° | — | — |
| 2022 | 24° | 7° | 15° | — | — |
| 2021 | 36° | 26° | 31° | — | — |
| 2020 | 42° | 30° | 36° | — | — |
| 2019 | 35° | 17° | 26° | — | — |
| 2018 | 51° | 35° | 43° | — | — |
| 2017 | 51° | 25° | 38° | — | — |
| 2016 | 19° | -6° | 7° | — | — |
| 2015 | 32° | 14° | 23° | — | — |
| 2014 | 33° | 27° | 30° | — | — |
| 2013 | 42° | 26° | 34° | 0.48" | — |
| 2012 | 43° | 31° | 37° | 2.46" | — |
| 2011 | 51° | 35° | 43° | — | — |
| 2010 | 21° | 2° | 11° | — | — |
| 2009 | 38° | 25° | 31° | 0.18" | — |
| 2008 | 31° | 25° | 28° | 0.13" | 0.5" |
| 2007 | 36° | 20° | 28° | — | — |
| 2006 | 42° | 20° | 31° | — | — |
| 2005 | 23° | 6° | 15° | — | — |
| 2004 | 28° | 6° | 17° | — | — |
| 2003 | 31° | 8° | 19° | — | — |
| 2002warmest | 56° | 36° | 46° | — | — |
| 2001 | 44° | 25° | 34° | 0.25" | — |
| 2000 | 22° | -3° | 10° | — | — |
| 1999 | 41° | 15° | 28° | 0.15" | — |
| 1998 | 39° | 27° | 33° | — | — |
| 1997 | 53° | 31° | 42° | — | — |
| 1996 | 18° | 1° | 9° | 0.1" | 0.3" |
| 1995 | 31° | 19° | 25° | — | — |
| 1994 | 42° | 31° | 36° | — | — |
| 1993 | 36° | 31° | 33° | — | — |
| 1992 | 34° | 11° | 22° | — | — |
| 1991 | 35° | 13° | 24° | — | — |
| 1990 | 46° | 40° | 43° | — | — |
| 1989coldest | 8° | -5° | 2° | — | — |
| 1988 | 56° | 32° | 44° | — | — |
| 1987 | 40° | 27° | 33° | 2.41" | — |
| 1986 | 44° | 20° | 32° | — | — |
| 1985 | 20° | 8° | 14° | — | — |
| 1984 | 33° | 15° | 24° | — | — |
| 1983 | 24° | 1° | 13° | — | — |
| 1982 | 33° | 25° | 29° | 0.13" | 0.4" |
| 1981 | 25° | 1° | 13° | — | — |
| 1980 | 12° | -3° | 5° | — | — |
| 1979 | 44° | 21° | 33° | — | — |
| 1978 | 34° | 21° | 27° | — | — |
| 1977 | 37° | 21° | 29° | 1.3" | 1.1" |
| 1976 | 44° | 15° | 30° | 0.05" | 0.3" |
| 1975 | 38° | 29° | 33° | — | — |
| 1974 | 31° | 14° | 22° | 0.38" | 2.5" |
| 1973 | 28° | 15° | 22° | — | — |
| 1972 | 37° | 32° | 35° | — | — |
| 1971 | 38° | 32° | 35° | — | — |
55 years of data from LISLE - MORTON ARBORETUM