- Weather Bureau Army Navy (WBAN): 94846
- Country: US
- State: IL
- Latitude: 41.96
- Longitude: -87.932
An Integrated Surface Dataset (ISD) station ID was found for this station. Newer data may be available at the ISD page.
High Temperatures
On July 31 in CHICAGO O'HARE INTERNATIONAL the average high temperature is 84.3 °F (29.1 °C). The lowest recored high temperature was 66.4 °F (19.1 °C) in 1947 and the highest recored high temperature was 99.0 °F (37.2 °C) in 2006. The high temperature is usually* between 80.0 °F (26.7 °C) and 88.7 °F (31.5 °C). About a quarter of the time, the high temperature is less than 80.0 °F (26.7 °C), and another quarter of the time, the high temperature is greater than and 88.7 °F (31.5 °C). About 95% of the time, the high temperature has been between 71.7 °F (22.1 °C) and 97.0 °F (36.1 °C).
Low Temperatures
On July 31 in CHICAGO O'HARE INTERNATIONAL the average low temperature is 63.7 °F (17.6 °C). The lowest recored low temperature was 50.0 °F (10.0 °C) in 1984 and the lowest recored low temperature was 80.1 °F (26.7 °C) in 1999. The low temperature is usually* between 59.5 °F (15.3 °C) and 67.9 °F (19.9 °C). About a quarter of the time, the low temperature is less than 59.5 °F (15.3 °C), and another quarter of the time, the low temperature is greater than and 67.9 °F (19.9 °C). About 95% of the time, the low temperature has been between 51.5 °F (10.8 °C) and 75.9 °F (24.4 °C).
Frost
On July 31 in CHICAGO O'HARE INTERNATIONAL 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
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— Weather Bureau Army Navy (WBAN): 94846 — from year 1970 to 1972