- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On May 12 in CHICAGO the average high temperature is 62.2 °F (16.8 °C). The lowest recored high temperature was 45.3 °F (7.4 °C) in 2019 and the highest recored high temperature was 84.2 °F (29.0 °C) in 2024. The high temperature is usually* between 53.9 °F (12.2 °C) and 70.6 °F (21.4 °C). About a quarter of the time, the high temperature is less than 53.9 °F (12.2 °C), and another quarter of the time, the high temperature is greater than and 70.6 °F (21.4 °C). About 95% of the time, the high temperature has been between 38.1 °F (3.4 °C) and 86.4 °F (30.2 °C).
Low Temperatures
On May 12 in CHICAGO the average low temperature is 48.7 °F (9.3 °C). The lowest recored low temperature was 40.5 °F (4.7 °C) in 2013 and the lowest recored low temperature was 57.6 °F (14.2 °C) in 2024. The low temperature is usually* between 44.7 °F (7.0 °C) and 52.8 °F (11.6 °C). About a quarter of the time, the low temperature is less than 44.7 °F (7.0 °C), and another quarter of the time, the low temperature is greater than and 52.8 °F (11.6 °C). About 95% of the time, the low temperature has been between 36.9 °F (2.7 °C) and 60.6 °F (15.9 °C).
Frost
On May 12 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.3% 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