July 20 - CHICAGO - Weather History and Averages

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

High Temperatures

On July 20 in CHICAGO the average high temperature is 80.2 °F (26.8 °C). The lowest recored high temperature was 67.3 °F (19.6 °C) in 2007 and the highest recored high temperature was 95.2 °F (35.1 °C) in 2011. The high temperature is usually^* between 75.3 °F (24.0 °C) and 85.0 °F (29.5 °C). About a quarter of the time, the high temperature is less than 75.3 °F (24.0 °C), and another quarter of the time, the high temperature is greater than and 85.0 °F (29.5 °C). About 95% of the time, the high temperature has been between 66.0 °F (18.9 °C) and 94.3 °F (34.6 °C).

Low Temperatures

On July 20 in CHICAGO the average low temperature is 71.4 °F (21.9 °C). The lowest recored low temperature was 63.0 °F (17.2 °C) in 2009 and the lowest recored low temperature was 78.6 °F (25.9 °C) in 2022. The low temperature is usually^* between 68.2 °F (20.1 °C) and 74.6 °F (23.7 °C). About a quarter of the time, the low temperature is less than 68.2 °F (20.1 °C), and another quarter of the time, the low temperature is greater than and 74.6 °F (23.7 °C). About 95% of the time, the low temperature has been between 62.1 °F (16.7 °C) and 80.7 °F (27.1 °C).

Frost

On July 20 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.0% 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 2005 to 2025

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