- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On March 12 in CHICAGO the average high temperature is 45.5 °F (7.5 °C). The lowest recored high temperature was 26.6 °F (-3.0 °C) in 2009 and the highest recored high temperature was 69.6 °F (20.9 °C) in 2024. The high temperature is usually* between 37.1 °F (2.9 °C) and 53.9 °F (12.2 °C). About a quarter of the time, the high temperature is less than 37.1 °F (2.9 °C), and another quarter of the time, the high temperature is greater than and 53.9 °F (12.2 °C). About 95% of the time, the high temperature has been between 21.2 °F (-6.0 °C) and 69.9 °F (21.0 °C).
Low Temperatures
On March 12 in CHICAGO the average low temperature is 32.8 °F (0.4 °C). The lowest recored low temperature was 11.5 °F (-11.4 °C) in 2022 and the lowest recored low temperature was 52.2 °F (11.2 °C) in 2024. The low temperature is usually* between 26.8 °F (-2.9 °C) and 38.8 °F (3.8 °C). About a quarter of the time, the low temperature is less than 26.8 °F (-2.9 °C), and another quarter of the time, the low temperature is greater than and 38.8 °F (3.8 °C). About 95% of the time, the low temperature has been between 15.4 °F (-9.2 °C) and 50.2 °F (10.1 °C).
Frost
On March 12 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 46.4% 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