- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On August 21 in WILMETTE (CGS) the average high temperature is 78.5 °F (25.8 °C). The lowest recored high temperature was 70.0 °F (21.1 °C) in 1990 and the highest recored high temperature was 88.0 °F (31.1 °C) in 1988. The high temperature is usually* between 73.9 °F (23.3 °C) and 83.0 °F (28.4 °C). About a quarter of the time, the high temperature is less than 73.9 °F (23.3 °C), and another quarter of the time, the high temperature is greater than and 83.0 °F (28.4 °C). About 95% of the time, the high temperature has been between 65.3 °F (18.5 °C) and 91.7 °F (33.2 °C).
Low Temperatures
On August 21 in WILMETTE (CGS) the average low temperature is 67.9 °F (20.0 °C). The lowest recored low temperature was 61.9 °F (16.6 °C) in 1989 and the lowest recored low temperature was 70.0 °F (21.1 °C) in 1988. The low temperature is usually* between 66.0 °F (18.9 °C) and 69.9 °F (21.0 °C). About a quarter of the time, the low temperature is less than 66.0 °F (18.9 °C), and another quarter of the time, the low temperature is greater than and 69.9 °F (21.0 °C). About 95% of the time, the low temperature has been between 62.3 °F (16.8 °C) and 73.5 °F (23.1 °C).
Frost
On August 21 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.
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