- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On October 20 in NORTHERLY ISLAND the average high temperature is 65.4 °F (18.6 °C). The lowest recored high temperature was 53.6 °F (12.0 °C) in 2020 and the highest recored high temperature was 78.4 °F (25.8 °C) in 2017. The high temperature is usually* between 59.3 °F (15.1 °C) and 71.6 °F (22.0 °C). About a quarter of the time, the high temperature is less than 59.3 °F (15.1 °C), and another quarter of the time, the high temperature is greater than and 71.6 °F (22.0 °C). About 95% of the time, the high temperature has been between 47.5 °F (8.6 °C) and 83.3 °F (28.5 °C).
Low Temperatures
On October 20 in NORTHERLY ISLAND the average low temperature is 46.6 °F (8.1 °C). The lowest recored low temperature was 35.6 °F (2.0 °C) in 2022 and the lowest recored low temperature was 55.0 °F (12.8 °C) in 2017. The low temperature is usually* between 42.4 °F (5.8 °C) and 50.9 °F (10.5 °C). About a quarter of the time, the low temperature is less than 42.4 °F (5.8 °C), and another quarter of the time, the low temperature is greater than and 50.9 °F (10.5 °C). About 95% of the time, the low temperature has been between 34.4 °F (1.4 °C) and 58.9 °F (14.9 °C).
Frost
On October 20 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 0.9% 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:
- NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 — from year 2012 to 2024