- Latitude: 41.786
- Longitude: -87.752
High Temperatures
On August 21 in this location the average high temperature is 82.0 °F (27.8 °C). The lowest recored high temperature was 70.0 °F (21.1 °C) in 2024 and the highest recored high temperature was 98.2 °F (36.8 °C) in 1955. The high temperature is usually* between 77.7 °F (25.4 °C) and 86.2 °F (30.1 °C). About a quarter of the time, the high temperature is less than 77.7 °F (25.4 °C), and another quarter of the time, the high temperature is greater than and 86.2 °F (30.1 °C). About 95% of the time, the high temperature has been between 69.6 °F (20.9 °C) and 94.3 °F (34.6 °C).
Low Temperatures
On August 21 in this location the average low temperature is 64.7 °F (18.2 °C). The lowest recored low temperature was 44.1 °F (6.7 °C) in 1950 and the lowest recored low temperature was 81.3 °F (27.4 °C) in 1947. The low temperature is usually* between 60.5 °F (15.8 °C) and 68.9 °F (20.5 °C). About a quarter of the time, the low temperature is less than 60.5 °F (15.8 °C), and another quarter of the time, the low temperature is greater than and 68.9 °F (20.5 °C). About 95% of the time, the low temperature has been between 52.5 °F (11.4 °C) and 76.9 °F (25.0 °C).
Frost
On August 21 in this location expect the temperatures to drop below freezing for a risk of frost about 0.0% 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 2025
- CHICAGO MIDWAY INTL ARPT — Integrated Surface Dataset (ISD) station ID: 725340 — Weather Bureau Army Navy (WBAN): 14819 — from year 1973 to 2025
- 9087044 - CALUMET IL — Integrated Surface Dataset (ISD) station ID: 997255 — from year 2005 to 2025
- NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 — from year 2012 to 2025
- FOSTER AVE CHICAGO — Integrated Surface Dataset (ISD) station ID: 998497 — from year 2012 to 2019
- CHICAGO/MEIGS — Integrated Surface Dataset (ISD) station ID: 725346 — from year 2000 to 2002
- CHICAGO/MEIGS — Integrated Surface Dataset (ISD) station ID: 725346 — Weather Bureau Army Navy (WBAN): 94866 — from year 1973 to 1999
- CHICAGO / CALUMET COAST GUARD — Integrated Surface Dataset (ISD) station ID: 725344 — from year 1994 to 1995
- CALUMET (CGS) — Integrated Surface Dataset (ISD) station ID: 722418 — from year 1987 to 1989
- CHICAGO MIDWAY AP — Weather Bureau Army Navy (WBAN): 14819 — from year 1948 to 1972
- CHICAGO OHARE INTL AP — Weather Bureau Army Navy (WBAN): 94846 — from year 1970 to 1972
- CHICAGO MEIGS FIELD — Weather Bureau Army Navy (WBAN): 94866 — from year 1966 to 1969
- PARK RIDGE AF — Weather Bureau Army Navy (WBAN): 14810 — from year 1949 to 1958