August 20 - Chicago - Weather History and Averages

High Temperatures

On August 20 in Chicago, IL (Illinois), USA the average high temperature is 81.4 °F (27.4 °C). The lowest recored high temperature was 64.0 °F (17.8 °C) in 1950 and the highest recored high temperature was 99.0 °F (37.2 °C) in 1983. The high temperature is usually* between 77.1 °F (25.1 °C) and 85.6 °F (29.8 °C). About a quarter of the time, the high temperature is less than 77.1 °F (25.1 °C), and another quarter of the time, the high temperature is greater than and 85.6 °F (29.8 °C). About 95% of the time, the high temperature has been between 69.0 °F (20.5 °C) and 93.7 °F (34.3 °C).

Low Temperatures

On August 20 in Chicago, IL (Illinois), USA the average low temperature is 64.7 °F (18.2 °C). The lowest recored low temperature was 44.1 °F (6.7 °C) in 1950 and the lowest recored low temperature was 79.3 °F (26.3 °C) in 1947. The low temperature is usually* between 60.7 °F (15.9 °C) and 68.7 °F (20.4 °C). About a quarter of the time, the low temperature is less than 60.7 °F (15.9 °C), and another quarter of the time, the low temperature is greater than and 68.7 °F (20.4 °C). About 95% of the time, the low temperature has been between 53.1 °F (11.7 °C) and 76.3 °F (24.6 °C).

Frost

On August 20 in Chicago, IL (Illinois), USA 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: