Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On May 18 in CHICAGO the average high temperature is 64.5 °F (18.0 °C). The lowest recored high temperature was 46.9 °F (8.3 °C) in 2011 and the highest recored high temperature was 79.3 °F (26.3 °C) in 2024. The high temperature is usually* between 57.4 °F (14.1 °C) and 71.5 °F (22.0 °C). About a quarter of the time, the high temperature is less than 57.4 °F (14.1 °C), and another quarter of the time, the high temperature is greater than and 71.5 °F (22.0 °C). About 95% of the time, the high temperature has been between 44.0 °F (6.7 °C) and 84.9 °F (29.4 °C).
Low Temperatures
On May 18 in CHICAGO the average low temperature is 51.4 °F (10.8 °C). The lowest recored low temperature was 43.5 °F (6.4 °C) in 2011 and the lowest recored low temperature was 67.1 °F (19.5 °C) in 2015. The low temperature is usually* between 46.9 °F (8.3 °C) and 56.0 °F (13.3 °C). About a quarter of the time, the low temperature is less than 46.9 °F (8.3 °C), and another quarter of the time, the low temperature is greater than and 56.0 °F (13.3 °C). About 95% of the time, the low temperature has been between 38.2 °F (3.5 °C) and 64.7 °F (18.2 °C).
Frost
On May 18 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.2% 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