Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On February 21 in CHICAGO the average high temperature is 40.1 °F (4.5 °C). The lowest recored high temperature was 25.7 °F (-3.5 °C) in 2015 and the highest recored high temperature was 63.5 °F (17.5 °C) in 2024. The high temperature is usually* between 32.2 °F (0.1 °C) and 48.1 °F (8.9 °C). About a quarter of the time, the high temperature is less than 32.2 °F (0.1 °C), and another quarter of the time, the high temperature is greater than and 48.1 °F (8.9 °C). About 95% of the time, the high temperature has been between 17.0 °F (-8.3 °C) and 63.2 °F (17.3 °C).
Low Temperatures
On February 21 in CHICAGO the average low temperature is 28.0 °F (-2.2 °C). The lowest recored low temperature was 15.4 °F (-9.2 °C) in 2020 and the lowest recored low temperature was 51.3 °F (10.7 °C) in 2017. The low temperature is usually* between 20.9 °F (-6.2 °C) and 35.2 °F (1.8 °C). About a quarter of the time, the low temperature is less than 20.9 °F (-6.2 °C), and another quarter of the time, the low temperature is greater than and 35.2 °F (1.8 °C). About 95% of the time, the low temperature has been between 7.3 °F (-13.7 °C) and 48.7 °F (9.3 °C).
Frost
On February 21 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 64.7% 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 2007 to 2025