March 21 - Chicago - Weather History and Averages

High Temperatures

On March 21 in Chicago, IL (Illinois), USA the average high temperature is 48.1 °F (9.0 °C). The lowest recored high temperature was 19.9 °F (-6.7 °C) in 1965 and the highest recored high temperature was 87.8 °F (31.0 °C) in 2012. The high temperature is usually* between 40.6 °F (4.8 °C) and 55.6 °F (13.1 °C). About a quarter of the time, the high temperature is less than 40.6 °F (4.8 °C), and another quarter of the time, the high temperature is greater than and 55.6 °F (13.1 °C). About 95% of the time, the high temperature has been between 26.3 °F (-3.2 °C) and 69.9 °F (21.1 °C).

Low Temperatures

On March 21 in Chicago, IL (Illinois), USA the average low temperature is 31.9 °F (-0.1 °C). The lowest recored low temperature was 8.1 °F (-13.3 °C) in 1986 and the lowest recored low temperature was 68.0 °F (20.0 °C) in 2012. The low temperature is usually* between 26.2 °F (-3.2 °C) and 37.5 °F (3.0 °C). About a quarter of the time, the low temperature is less than 26.2 °F (-3.2 °C), and another quarter of the time, the low temperature is greater than and 37.5 °F (3.0 °C). About 95% of the time, the low temperature has been between 15.6 °F (-9.1 °C) and 48.1 °F (9.0 °C).

Frost

On March 21 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 50.7% 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: