- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On September 30 in WILMETTE (CGS) the average high temperature is 66.4 °F (19.1 °C). The lowest recored high temperature was 58.8 °F (14.9 °C) in 1990 and the highest recored high temperature was 74.8 °F (23.8 °C) in 1988. The high temperature is usually* between 62.7 °F (17.1 °C) and 70.0 °F (21.1 °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 70.0 °F (21.1 °C). About 95% of the time, the high temperature has been between 55.7 °F (13.2 °C) and 77.0 °F (25.0 °C).
Low Temperatures
On September 30 in WILMETTE (CGS) the average low temperature is 52.8 °F (11.5 °C). The lowest recored low temperature was 30.0 °F (-1.1 °C) in 1990 and the lowest recored low temperature was 63.0 °F (17.2 °C) in 1988. The low temperature is usually* between 46.2 °F (7.9 °C) and 59.3 °F (15.2 °C). About a quarter of the time, the low temperature is less than 46.2 °F (7.9 °C), and another quarter of the time, the low temperature is greater than and 59.3 °F (15.2 °C). About 95% of the time, the low temperature has been between 33.7 °F (0.9 °C) and 71.8 °F (22.1 °C).
Frost
On September 30 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 1.7% 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