High Temperatures
On July 17 in Chicago, IL (Illinois), USA the average high temperature is 84.8 °F (29.4 °C). The lowest recored high temperature was 66.0 °F (18.9 °C) in 1979 and the highest recored high temperature was 100.4 °F (38.0 °C) in 2012. The high temperature is usually* between 80.4 °F (26.9 °C) and 89.3 °F (31.8 °C). About a quarter of the time, the high temperature is less than 80.4 °F (26.9 °C), and another quarter of the time, the high temperature is greater than and 89.3 °F (31.8 °C). About 95% of the time, the high temperature has been between 72.0 °F (22.2 °C) and 97.7 °F (36.5 °C).
Low Temperatures
On July 17 in Chicago, IL (Illinois), USA the average low temperature is 67.4 °F (19.7 °C). The lowest recored low temperature was 2.8 °F (-16.2 °C) in 1994 and the lowest recored low temperature was 82.6 °F (28.1 °C) in 2012. The low temperature is usually* between 63.2 °F (17.3 °C) and 71.6 °F (22.0 °C). About a quarter of the time, the low temperature is less than 63.2 °F (17.3 °C), and another quarter of the time, the low temperature is greater than and 71.6 °F (22.0 °C). About 95% of the time, the low temperature has been between 55.1 °F (12.8 °C) and 79.7 °F (26.5 °C).
Frost
On July 17 in Chicago, IL (Illinois), USA 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:
- 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
- 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
- GARY/CHICAGO AIRPORT — Integrated Surface Dataset (ISD) station ID: 725337 — Weather Bureau Army Navy (WBAN): 04807 — from year 2006 to 2025
- CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2025
- FOSTER AVE CHICAGO — Integrated Surface Dataset (ISD) station ID: 998497 — from year 2012 to 2019
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— Integrated Surface Dataset (ISD) station ID: 725337 — from year 1982 to 2005 - 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
- NAVAL AIR STATION — Integrated Surface Dataset (ISD) station ID: 725306 — Weather Bureau Army Navy (WBAN): 14855 — from year 1973 to 1994
- WILMETTE (MARINES)& — Integrated Surface Dataset (ISD) station ID: 725307 — from year 1976 to 1994
- CHICAGO / CALUMET COAST GUARD — Integrated Surface Dataset (ISD) station ID: 725344 — from year 1994 to 1994
- WILMETTE (CGS) — Integrated Surface Dataset (ISD) station ID: 722417 — from year 1987 to 1990
- CALUMET (CGS) — Integrated Surface Dataset (ISD) station ID: 722418 — from year 1987 to 1990
- 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
- NAVAL AIR STATION — Weather Bureau Army Navy (WBAN): 14855 — from year 1945 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