August 20 - WILMETTE (CGS) - Weather History and Averages

Station: WILMETTE (CGS) (1987 to 1991)
Country: US
State: IL
Latitude: 42.067
Longitude: -87.683

High Temperatures

On August 20 in WILMETTE (CGS) the average high temperature is 79.4 °F (26.3 °C). The lowest recored high temperature was 70.9 °F (21.6 °C) in 1990 and the highest recored high temperature was 84.9 °F (29.4 °C) in 1988. The high temperature is usually^* between 74.7 °F (23.7 °C) and 84.1 °F (28.9 °C). About a quarter of the time, the high temperature is less than 74.7 °F (23.7 °C), and another quarter of the time, the high temperature is greater than and 84.1 °F (28.9 °C). About 95% of the time, the high temperature has been between 65.8 °F (18.8 °C) and 92.9 °F (33.9 °C).

Low Temperatures

On August 20 in WILMETTE (CGS) the average low temperature is 66.6 °F (19.2 °C). The lowest recored low temperature was 66.9 °F (19.4 °C) in 1990 and the lowest recored low temperature was 68.9 °F (20.5 °C) in 1989. The low temperature is usually^* between 64.6 °F (18.1 °C) and 68.5 °F (20.3 °C). About a quarter of the time, the low temperature is less than 64.6 °F (18.1 °C), and another quarter of the time, the low temperature is greater than and 68.5 °F (20.3 °C). About 95% of the time, the low temperature has been between 61.0 °F (16.1 °C) and 72.1 °F (22.3 °C).

Frost

On August 20 in WILMETTE (CGS) 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:

WILMETTE (CGS) — Integrated Surface Dataset (ISD) station ID: 722417 — from year 1988 to 1990

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