March 18 - CHICAGO - Weather History and Averages

Station: CHICAGO (2005 to 2025)
Country: US
State: IL
Latitude: 42.0
Longitude: -87.5

High Temperatures

On March 18 in CHICAGO the average high temperature is 47.8 °F (8.8 °C). The lowest recored high temperature was 31.3 °F (-0.4 °C) in 2023 and the highest recored high temperature was 70.7 °F (21.5 °C) in 2012. The high temperature is usually^* between 39.2 °F (4.0 °C) and 56.3 °F (13.5 °C). About a quarter of the time, the high temperature is less than 39.2 °F (4.0 °C), and another quarter of the time, the high temperature is greater than and 56.3 °F (13.5 °C). About 95% of the time, the high temperature has been between 23.0 °F (-5.0 °C) and 72.6 °F (22.5 °C).

Low Temperatures

On March 18 in CHICAGO the average low temperature is 35.7 °F (2.0 °C). The lowest recored low temperature was 13.1 °F (-10.5 °C) in 2023 and the lowest recored low temperature was 57.7 °F (14.3 °C) in 2012. The low temperature is usually^* between 30.0 °F (-1.1 °C) and 41.3 °F (5.1 °C). About a quarter of the time, the low temperature is less than 30.0 °F (-1.1 °C), and another quarter of the time, the low temperature is greater than and 41.3 °F (5.1 °C). About 95% of the time, the low temperature has been between 19.4 °F (-7.0 °C) and 51.9 °F (11.1 °C).

Frost

On March 18 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 33.0% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

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

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