Station information
- Integrated Surface Dataset (ISD) station ID: 722417
- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On September 20 in WILMETTE (CGS) the average high temperature is 65.9 °F (18.8 °C). The lowest recored high temperature was 63.0 °F (17.2 °C) in 1987 and the highest recored high temperature was 70.0 °F (21.1 °C) in 1989. The high temperature is usually* between 62.7 °F (17.1 °C) and 69.1 °F (20.6 °C). About a quarter of the time, the high temperature is less than 62.7 °F (17.1 °C), and another quarter of the time, the high temperature is greater than and 69.1 °F (20.6 °C). About 95% of the time, the high temperature has been between 56.6 °F (13.7 °C) and 75.2 °F (24.0 °C).
Low Temperatures
On September 20 in WILMETTE (CGS) the average low temperature is 54.7 °F (12.6 °C). The lowest recored low temperature was 43.0 °F (6.1 °C) in 1990 and the lowest recored low temperature was 61.9 °F (16.6 °C) in 1989. The low temperature is usually* between 50.4 °F (10.2 °C) and 59.0 °F (15.0 °C). About a quarter of the time, the low temperature is less than 50.4 °F (10.2 °C), and another quarter of the time, the low temperature is greater than and 59.0 °F (15.0 °C). About 95% of the time, the low temperature has been between 42.3 °F (5.7 °C) and 67.1 °F (19.5 °C).
Frost
On September 20 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 1987 to 1990