- Country: US
- State: IL
- Latitude: 42.067
- Longitude: -87.683
High Temperatures
On April 20 in WILMETTE (CGS) the average high temperature is 52.8 °F (11.5 °C). The lowest recored high temperature was 50.9 °F (10.5 °C) in 1988 and the highest recored high temperature was 61.0 °F (16.1 °C) in 1989. The high temperature is usually* between 48.0 °F (8.9 °C) and 57.5 °F (14.2 °C). About a quarter of the time, the high temperature is less than 48.0 °F (8.9 °C), and another quarter of the time, the high temperature is greater than and 57.5 °F (14.2 °C). About 95% of the time, the high temperature has been between 39.0 °F (3.9 °C) and 66.6 °F (19.2 °C).
Low Temperatures
On April 20 in WILMETTE (CGS) the average low temperature is 40.6 °F (4.8 °C). The lowest recored low temperature was 41.9 °F (5.5 °C) in 1988 and the lowest recored low temperature was 52.9 °F (11.6 °C) in 1990. The low temperature is usually* between 36.0 °F (2.2 °C) and 45.2 °F (7.3 °C). About a quarter of the time, the low temperature is less than 36.0 °F (2.2 °C), and another quarter of the time, the low temperature is greater than and 45.2 °F (7.3 °C). About 95% of the time, the low temperature has been between 27.4 °F (-2.6 °C) and 53.9 °F (12.1 °C).
Frost
On April 20 in WILMETTE (CGS) expect the temperatures to drop below freezing for a risk of frost about 10.1% 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 1988 to 1990