October 17 - Chicago - Weather History and Averages

High Temperatures

On October 17 in Chicago, IL (Illinois), USA the average high temperature is 63.6 °F (17.6 °C). The lowest recored high temperature was 43.0 °F (6.1 °C) in 1948 and the highest recored high temperature was 86.0 °F (30.0 °C) in 1950. The high temperature is usually* between 57.0 °F (13.9 °C) and 70.2 °F (21.2 °C). About a quarter of the time, the high temperature is less than 57.0 °F (13.9 °C), and another quarter of the time, the high temperature is greater than and 70.2 °F (21.2 °C). About 95% of the time, the high temperature has been between 44.5 °F (6.9 °C) and 82.7 °F (28.2 °C).

Low Temperatures

On October 17 in Chicago, IL (Illinois), USA the average low temperature is 45.7 °F (7.6 °C). The lowest recored low temperature was 28.0 °F (-2.2 °C) in 1992 and the lowest recored low temperature was 70.0 °F (21.1 °C) in 1968. The low temperature is usually* between 40.1 °F (4.5 °C) and 51.3 °F (10.7 °C). About a quarter of the time, the low temperature is less than 40.1 °F (4.5 °C), and another quarter of the time, the low temperature is greater than and 51.3 °F (10.7 °C). About 95% of the time, the low temperature has been between 29.5 °F (-1.4 °C) and 61.9 °F (16.6 °C).

Frost

On October 17 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 4.9% 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: