October 31 - Chicago - Weather History and Averages

High Temperatures

On October 31 in Chicago, IL (Illinois), USA the average high temperature is 58.9 °F (14.9 °C). The lowest recored high temperature was 35.6 °F (2.0 °C) in 2023 and the highest recored high temperature was 84.0 °F (28.9 °C) in 1950. The high temperature is usually* between 52.3 °F (11.3 °C) and 65.5 °F (18.6 °C). About a quarter of the time, the high temperature is less than 52.3 °F (11.3 °C), and another quarter of the time, the high temperature is greater than and 65.5 °F (18.6 °C). About 95% of the time, the high temperature has been between 39.7 °F (4.3 °C) and 78.0 °F (25.6 °C).

Low Temperatures

On October 31 in Chicago, IL (Illinois), USA the average low temperature is 42.8 °F (6.0 °C). The lowest recored low temperature was 21.0 °F (-6.1 °C) in 1988 and the lowest recored low temperature was 64.9 °F (18.3 °C) in 1974. The low temperature is usually* between 37.4 °F (3.0 °C) and 48.2 °F (9.0 °C). About a quarter of the time, the low temperature is less than 37.4 °F (3.0 °C), and another quarter of the time, the low temperature is greater than and 48.2 °F (9.0 °C). About 95% of the time, the low temperature has been between 27.1 °F (-2.7 °C) and 58.6 °F (14.8 °C).

Frost

On October 31 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 8.9% 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: