- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On December 20 in WILMETTE (CGS) the average high temperature is 39.2 °F (4.0 °C). The lowest recored high temperature was 36.9 °F (2.7 °C) in 1987 and the highest recored high temperature was 56.8 °F (13.8 °C) in 1988. The high temperature is usually* between 31.1 °F (-0.5 °C) and 47.3 °F (8.5 °C). About a quarter of the time, the high temperature is less than 31.1 °F (-0.5 °C), and another quarter of the time, the high temperature is greater than and 47.3 °F (8.5 °C). About 95% of the time, the high temperature has been between 15.7 °F (-9.1 °C) and 62.8 °F (17.1 °C).
Low Temperatures
On December 20 in WILMETTE (CGS) the average low temperature is 27.4 °F (-2.5 °C). The lowest recored low temperature was 2.1 °F (-16.6 °C) in 1989 and the lowest recored low temperature was 47.8 °F (8.8 °C) in 1988. The low temperature is usually* between 19.2 °F (-7.1 °C) and 35.7 °F (2.1 °C). About a quarter of the time, the low temperature is less than 19.2 °F (-7.1 °C), and another quarter of the time, the low temperature is greater than and 35.7 °F (2.1 °C). About 95% of the time, the low temperature has been between 3.4 °F (-15.9 °C) and 51.5 °F (10.8 °C).
Frost
On December 20 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 64.5% 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