- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On October 21 in WILMETTE (CGS) the average high temperature is 52.3 °F (11.3 °C). The lowest recored high temperature was 39.9 °F (4.4 °C) in 1987 and the highest recored high temperature was 63.0 °F (17.2 °C) in 1990. The high temperature is usually* between 47.0 °F (8.4 °C) and 57.6 °F (14.2 °C). About a quarter of the time, the high temperature is less than 47.0 °F (8.4 °C), and another quarter of the time, the high temperature is greater than and 57.6 °F (14.2 °C). About 95% of the time, the high temperature has been between 37.0 °F (2.8 °C) and 67.6 °F (19.8 °C).
Low Temperatures
On October 21 in WILMETTE (CGS) the average low temperature is 39.5 °F (4.2 °C). The lowest recored low temperature was 34.9 °F (1.6 °C) in 1987 and the lowest recored low temperature was 43.9 °F (6.6 °C) in 1988. The low temperature is usually* between 36.4 °F (2.4 °C) and 42.6 °F (5.9 °C). About a quarter of the time, the low temperature is less than 36.4 °F (2.4 °C), and another quarter of the time, the low temperature is greater than and 42.6 °F (5.9 °C). About 95% of the time, the low temperature has been between 30.5 °F (-0.8 °C) and 48.5 °F (9.2 °C).
Frost
On October 21 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 5.2% 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 1987 to 1990