- Integrated Surface Dataset (ISD) station ID: 725300
- Country: US
- State: IL
- Latitude: 41.96
- Longitude: -87.932
A Weather Bureau Army Navy (WBAN) station ID was found for this station. Older data may be available at the WBAN page.
High Temperatures
On September 21 in CHICAGO O'HARE INTERNATIONAL the average high temperature is 74.8 °F (23.8 °C). The lowest recored high temperature was 53.1 °F (11.7 °C) in 1983 and the highest recored high temperature was 93.9 °F (34.4 °C) in 2017. The high temperature is usually* between 68.8 °F (20.4 °C) and 80.8 °F (27.1 °C). About a quarter of the time, the high temperature is less than 68.8 °F (20.4 °C), and another quarter of the time, the high temperature is greater than and 80.8 °F (27.1 °C). About 95% of the time, the high temperature has been between 57.3 °F (14.0 °C) and 92.4 °F (33.5 °C).
Low Temperatures
On September 21 in CHICAGO O'HARE INTERNATIONAL the average low temperature is 53.5 °F (11.9 °C). The lowest recored low temperature was 33.1 °F (0.6 °C) in 1962 and the lowest recored low temperature was 73.0 °F (22.8 °C) in 1970. The low temperature is usually* between 47.8 °F (8.8 °C) and 59.2 °F (15.1 °C). About a quarter of the time, the low temperature is less than 47.8 °F (8.8 °C), and another quarter of the time, the low temperature is greater than and 59.2 °F (15.1 °C). About 95% of the time, the low temperature has been between 36.9 °F (2.7 °C) and 70.1 °F (21.2 °C).
Frost
On September 21 in CHICAGO O'HARE INTERNATIONAL expect the temperatures to drop below freezing for a risk of frost about 0.6% 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: