Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On April 18 in CHICAGO the average high temperature is 55.4 °F (13.0 °C). The lowest recored high temperature was 36.3 °F (2.4 °C) in 2018 and the highest recored high temperature was 75.9 °F (24.4 °C) in 2025. The high temperature is usually* between 47.5 °F (8.6 °C) and 63.2 °F (17.4 °C). About a quarter of the time, the high temperature is less than 47.5 °F (8.6 °C), and another quarter of the time, the high temperature is greater than and 63.2 °F (17.4 °C). About 95% of the time, the high temperature has been between 32.5 °F (0.3 °C) and 78.2 °F (25.7 °C).
Low Temperatures
On April 18 in CHICAGO the average low temperature is 41.1 °F (5.0 °C). The lowest recored low temperature was 32.5 °F (0.3 °C) in 2011 and the lowest recored low temperature was 52.9 °F (11.6 °C) in 2025. The low temperature is usually* between 37.1 °F (2.9 °C) and 45.0 °F (7.2 °C). About a quarter of the time, the low temperature is less than 37.1 °F (2.9 °C), and another quarter of the time, the low temperature is greater than and 45.0 °F (7.2 °C). About 95% of the time, the low temperature has been between 29.7 °F (-1.3 °C) and 52.4 °F (11.3 °C).
Frost
On April 18 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 5.9% 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