- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On December 15 in WILMETTE (CGS) the average high temperature is 30.1 °F (-1.1 °C). The lowest recored high temperature was 15.1 °F (-9.4 °C) in 1989 and the highest recored high temperature was 43.0 °F (6.1 °C) in 1990. The high temperature is usually* between 22.3 °F (-5.4 °C) and 37.9 °F (3.3 °C). About a quarter of the time, the high temperature is less than 22.3 °F (-5.4 °C), and another quarter of the time, the high temperature is greater than and 37.9 °F (3.3 °C). About 95% of the time, the high temperature has been between 7.4 °F (-13.7 °C) and 52.8 °F (11.5 °C).
Low Temperatures
On December 15 in WILMETTE (CGS) the average low temperature is 19.6 °F (-6.9 °C). The lowest recored low temperature was 2.1 °F (-16.6 °C) in 1989 and the lowest recored low temperature was 31.1 °F (-0.5 °C) in 1987. The low temperature is usually* between 10.8 °F (-11.8 °C) and 28.3 °F (-2.0 °C). About a quarter of the time, the low temperature is less than 10.8 °F (-11.8 °C), and another quarter of the time, the low temperature is greater than and 28.3 °F (-2.0 °C). About 95% of the time, the low temperature has been between -5.8 °F (-21.0 °C) and 45.0 °F (7.2 °C).
Frost
On December 15 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 83.1% 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