- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On December 17 in WILMETTE (CGS) the average high temperature is 26.1 °F (-3.3 °C). The lowest recored high temperature was 18.1 °F (-7.7 °C) in 1989 and the highest recored high temperature was 37.9 °F (3.3 °C) in 1990. The high temperature is usually* between 19.6 °F (-6.9 °C) and 32.6 °F (0.3 °C). About a quarter of the time, the high temperature is less than 19.6 °F (-6.9 °C), and another quarter of the time, the high temperature is greater than and 32.6 °F (0.3 °C). About 95% of the time, the high temperature has been between 7.3 °F (-13.7 °C) and 44.9 °F (7.2 °C).
Low Temperatures
On December 17 in WILMETTE (CGS) the average low temperature is 17.1 °F (-8.3 °C). The lowest recored low temperature was 3.0 °F (-16.1 °C) in 1989 and the lowest recored low temperature was 34.9 °F (1.6 °C) in 1990. The low temperature is usually* between 9.0 °F (-12.8 °C) and 25.3 °F (-3.7 °C). About a quarter of the time, the low temperature is less than 9.0 °F (-12.8 °C), and another quarter of the time, the low temperature is greater than and 25.3 °F (-3.7 °C). About 95% of the time, the low temperature has been between -6.5 °F (-21.4 °C) and 40.8 °F (4.9 °C).
Frost
On December 17 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 89.1% 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