Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On July 21 in CHICAGO the average high temperature is 79.6 °F (26.5 °C). The lowest recored high temperature was 66.9 °F (19.4 °C) in 2007 and the highest recored high temperature was 93.7 °F (34.3 °C) in 2011. The high temperature is usually* between 75.0 °F (23.9 °C) and 84.3 °F (29.0 °C). About a quarter of the time, the high temperature is less than 75.0 °F (23.9 °C), and another quarter of the time, the high temperature is greater than and 84.3 °F (29.0 °C). About 95% of the time, the high temperature has been between 66.2 °F (19.0 °C) and 93.1 °F (33.9 °C).
Low Temperatures
On July 21 in CHICAGO the average low temperature is 71.2 °F (21.8 °C). The lowest recored low temperature was 64.6 °F (18.1 °C) in 2007 and the lowest recored low temperature was 87.3 °F (30.7 °C) in 2022. The low temperature is usually* between 68.3 °F (20.2 °C) and 74.1 °F (23.4 °C). About a quarter of the time, the low temperature is less than 68.3 °F (20.2 °C), and another quarter of the time, the low temperature is greater than and 74.1 °F (23.4 °C). About 95% of the time, the low temperature has been between 62.7 °F (17.1 °C) and 79.7 °F (26.5 °C).
Frost
On July 21 in CHICAGO 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 — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2025