Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On August 20 in CHICAGO the average high temperature is 77.8 °F (25.4 °C). The lowest recored high temperature was 70.7 °F (21.5 °C) in 2024 and the highest recored high temperature was 83.7 °F (28.7 °C) in 2010. The high temperature is usually* between 74.7 °F (23.7 °C) and 80.9 °F (27.2 °C). About a quarter of the time, the high temperature is less than 74.7 °F (23.7 °C), and another quarter of the time, the high temperature is greater than and 80.9 °F (27.2 °C). About 95% of the time, the high temperature has been between 68.9 °F (20.5 °C) and 86.7 °F (30.4 °C).
Low Temperatures
On August 20 in CHICAGO the average low temperature is 69.2 °F (20.7 °C). The lowest recored low temperature was 59.7 °F (15.4 °C) in 2015 and the lowest recored low temperature was 74.7 °F (23.7 °C) in 2021. The low temperature is usually* between 66.6 °F (19.2 °C) and 71.7 °F (22.1 °C). About a quarter of the time, the low temperature is less than 66.6 °F (19.2 °C), and another quarter of the time, the low temperature is greater than and 71.7 °F (22.1 °C). About 95% of the time, the low temperature has been between 61.7 °F (16.5 °C) and 76.6 °F (24.8 °C).
Frost
On August 20 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 2024