Weather on October 20
Chicago, IL
55 Years of Data
Avg High
61°F
Avg Low
46°F
Warmest
1979
70°F avg
Coldest
1989
36°F avg
About This Date
October 20th in Chicago, IL typically brings mild fall weather, with average highs around 61°F and lows near 46°F. Over 55 years of records, the warmest October 20th was in 1979 (70°F average), while the coldest was 1989 (36°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 18% of October 20th dates historically, with the wettest October 20th recording 1.91" of rain. 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 October 20th in Chicago, IL? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 45° | 55° | — | — |
| 2024 | 77° | 53° | 65° | — | — |
| 2023 | 58° | 52° | 55° | — | — |
| 2022 | 61° | 35° | 48° | — | — |
| 2021 | 72° | 55° | 63° | — | — |
| 2020 | 54° | 44° | 49° | — | — |
| 2019 | 59° | 49° | 54° | — | — |
| 2018 | 52° | 36° | 44° | — | — |
| 2017 | 79° | 58° | 68° | — | — |
| 2016 | 59° | 49° | 54° | — | — |
| 2015 | 76° | 56° | 66° | — | — |
| 2014 | 60° | 50° | 55° | — | — |
| 2013 | 66° | 42° | 54° | — | — |
| 2012 | 60° | 43° | 51° | — | — |
| 2011 | 50° | 45° | 47° | — | — |
| 2010 | 72° | 51° | 61° | — | — |
| 2009 | 64° | 53° | 59° | — | — |
| 2008 | 59° | 51° | 55° | — | — |
| 2007 | 75° | 52° | 63° | — | — |
| 2006 | 54° | 39° | 46° | — | — |
| 2005 | 55° | 52° | 53° | — | — |
| 2004 | 54° | 51° | 52° | — | — |
| 2003 | 85° | 54° | 69° | — | — |
| 2002 | 53° | 33° | 43° | — | — |
| 2001 | 69° | 45° | 57° | — | — |
| 2000 | 77° | 53° | 65° | — | — |
| 1999 | 54° | 37° | 45° | — | — |
| 1998 | 58° | 41° | 49° | 0.05" | — |
| 1997 | 53° | 40° | 46° | — | — |
| 1996 | 61° | 36° | 48° | — | — |
| 1995 | 51° | 42° | 47° | 1.47" | — |
| 1994 | 75° | 51° | 63° | — | — |
| 1993 | 58° | 52° | 55° | 0.1" | — |
| 1992 | 54° | 35° | 44° | 0.28" | — |
| 1991 | 53° | 35° | 44° | — | — |
| 1990 | 62° | 43° | 52° | — | — |
| 1989coldest | 39° | 33° | 36° | 1.91" | — |
| 1988 | 53° | 40° | 46° | — | — |
| 1987 | 56° | 42° | 49° | 1.04" | — |
| 1986 | 70° | 45° | 57° | — | — |
| 1985 | 57° | 55° | 56° | — | — |
| 1984 | 61° | 43° | 52° | 0.03" | — |
| 1983 | 54° | 47° | 50° | 0.15" | — |
| 1982 | 63° | 40° | 51° | 1.27" | — |
| 1981 | 68° | 45° | 56° | — | — |
| 1980 | 59° | 46° | 53° | — | — |
| 1979warmest | 73° | 67° | 70° | — | — |
| 1978 | 69° | 42° | 56° | — | — |
| 1977 | 63° | 43° | 53° | — | — |
| 1976 | 48° | 36° | 42° | 0.05" | — |
| 1975 | 70° | 47° | 58° | — | — |
| 1974 | 42° | 38° | 40° | — | — |
| 1973 | 56° | 50° | 53° | — | — |
| 1972 | 47° | 34° | 40° | — | — |
| 1971 | 79° | 58° | 68° | — | — |
55 years of data from CHICAGO GRANT PARK