- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On January 18 in CHICAGO the average high temperature is 32.3 °F (0.2 °C). The lowest recored high temperature was 8.6 °F (-13.0 °C) in 2016 and the highest recored high temperature was 47.8 °F (8.8 °C) in 2025. The high temperature is usually* between 26.3 °F (-3.2 °C) and 38.3 °F (3.5 °C). About a quarter of the time, the high temperature is less than 26.3 °F (-3.2 °C), and another quarter of the time, the high temperature is greater than and 38.3 °F (3.5 °C). About 95% of the time, the high temperature has been between 14.8 °F (-9.6 °C) and 49.8 °F (9.9 °C).
Low Temperatures
On January 18 in CHICAGO the average low temperature is 20.8 °F (-6.2 °C). The lowest recored low temperature was -1.3 °F (-18.5 °C) in 2016 and the lowest recored low temperature was 36.0 °F (2.2 °C) in 2023. The low temperature is usually* between 13.4 °F (-10.3 °C) and 28.1 °F (-2.1 °C). About a quarter of the time, the low temperature is less than 13.4 °F (-10.3 °C), and another quarter of the time, the low temperature is greater than and 28.1 °F (-2.1 °C). About 95% of the time, the low temperature has been between -0.7 °F (-18.1 °C) and 42.2 °F (5.7 °C).
Frost
On January 18 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 84.8% 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