- Latitude: 42.121
- Longitude: -87.905
High Temperatures
On September 20 in this location the average high temperature is 74.9 °F (23.9 °C). The lowest recored high temperature was 55.0 °F (12.8 °C) in 1962 and the highest recored high temperature was 93.0 °F (33.9 °C) in 2018. The high temperature is usually* between 69.2 °F (20.7 °C) and 80.7 °F (27.0 °C). About a quarter of the time, the high temperature is less than 69.2 °F (20.7 °C), and another quarter of the time, the high temperature is greater than and 80.7 °F (27.0 °C). About 95% of the time, the high temperature has been between 58.2 °F (14.6 °C) and 91.6 °F (33.1 °C).
Low Temperatures
On September 20 in this location the average low temperature is 55.6 °F (13.1 °C). The lowest recored low temperature was 32.0 °F (0.0 °C) in 1956 and the lowest recored low temperature was 75.2 °F (24.0 °C) in 2002. The low temperature is usually* between 50.1 °F (10.1 °C) and 61.0 °F (16.1 °C). About a quarter of the time, the low temperature is less than 50.1 °F (10.1 °C), and another quarter of the time, the low temperature is greater than and 61.0 °F (16.1 °C). About 95% of the time, the low temperature has been between 39.9 °F (4.4 °C) and 71.2 °F (21.8 °C).
Frost
On September 20 in this location expect the temperatures to drop below freezing for a risk of frost about 0.2% of the time.
Data Source(s)
The data used to compute the average high/low temperatures for this location were taken from the following stations:
- CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 — from year 1947 to 2024
- PALWAUKEE MUNICIPAL ARPT — Integrated Surface Dataset (ISD) station ID: 744665 — Weather Bureau Army Navy (WBAN): 04838 — from year 2006 to 2024
- WAUKEGAN HARBOR — Integrated Surface Dataset (ISD) station ID: 997735 — from year 2007 to 2023
- FOSTER AVE CHICAGO — Integrated Surface Dataset (ISD) station ID: 998497 — from year 2012 to 2017
- PALWAUKEE MUNI — Integrated Surface Dataset (ISD) station ID: 744665 — from year 1995 to 2005
- ANN ARBOR MUNICIPAL — Integrated Surface Dataset (ISD) station ID: 725374 — from year 1999 to 2005
- CHIGAGO-WAUKEE ARPT — Integrated Surface Dataset (ISD) station ID: 725339 — from year 2001 to 2001
- WILMETTE (MARINES)& — Integrated Surface Dataset (ISD) station ID: 725307 — from year 1976 to 1995
- NAVAL AIR STATION — Integrated Surface Dataset (ISD) station ID: 725306 — Weather Bureau Army Navy (WBAN): 14855 — from year 1973 to 1994
- WILMETTE (CGS) — Integrated Surface Dataset (ISD) station ID: 722417 — from year 1987 to 1990
- NAVAL AIR STATION — Weather Bureau Army Navy (WBAN): 14855 — from year 1945 to 1972
- CHICAGO OHARE INTL AP — Weather Bureau Army Navy (WBAN): 94846 — from year 1970 to 1972
- PARK RIDGE AF — Weather Bureau Army Navy (WBAN): 14810 — from year 1949 to 1958