December 20 - Chicago - Weather History and Averages

High Temperatures

On December 20 in Chicago, IL (Illinois), USA the average high temperature is 34.9 °F (1.6 °C). The lowest recored high temperature was 6.1 °F (-14.4 °C) in 1963 and the highest recored high temperature was 59.0 °F (15.0 °C) in 1988. The high temperature is usually* between 27.8 °F (-2.3 °C) and 42.0 °F (5.5 °C). About a quarter of the time, the high temperature is less than 27.8 °F (-2.3 °C), and another quarter of the time, the high temperature is greater than and 42.0 °F (5.5 °C). About 95% of the time, the high temperature has been between 14.4 °F (-9.8 °C) and 55.4 °F (13.0 °C).

Low Temperatures

On December 20 in Chicago, IL (Illinois), USA the average low temperature is 22.1 °F (-5.5 °C). The lowest recored low temperature was -15.7 °F (-26.5 °C) in 1963 and the lowest recored low temperature was 51.1 °F (10.6 °C) in 1988. The low temperature is usually* between 14.0 °F (-10.0 °C) and 30.2 °F (-1.0 °C). About a quarter of the time, the low temperature is less than 14.0 °F (-10.0 °C), and another quarter of the time, the low temperature is greater than and 30.2 °F (-1.0 °C). About 95% of the time, the low temperature has been between -1.4 °F (-18.6 °C) and 45.6 °F (7.6 °C).

Frost

On December 20 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 79.5% 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: