- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On September 12 in WILMETTE (CGS) the average high temperature is 74.3 °F (23.5 °C). The lowest recored high temperature was 68.9 °F (20.5 °C) in 1989 and the highest recored high temperature was 88.0 °F (31.1 °C) in 1988. The high temperature is usually* between 69.3 °F (20.7 °C) and 79.4 °F (26.3 °C). About a quarter of the time, the high temperature is less than 69.3 °F (20.7 °C), and another quarter of the time, the high temperature is greater than and 79.4 °F (26.3 °C). About 95% of the time, the high temperature has been between 59.6 °F (15.3 °C) and 89.0 °F (31.7 °C).
Low Temperatures
On September 12 in WILMETTE (CGS) the average low temperature is 61.4 °F (16.4 °C). The lowest recored low temperature was 56.8 °F (13.8 °C) in 1989 and the lowest recored low temperature was 70.0 °F (21.1 °C) in 1988. The low temperature is usually* between 57.1 °F (13.9 °C) and 65.8 °F (18.8 °C). About a quarter of the time, the low temperature is less than 57.1 °F (13.9 °C), and another quarter of the time, the low temperature is greater than and 65.8 °F (18.8 °C). About 95% of the time, the low temperature has been between 48.8 °F (9.3 °C) and 74.1 °F (23.4 °C).
Frost
On September 12 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