Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On June 20 in NORTHERLY ISLAND the average high temperature is 81.4 °F (27.4 °C). The lowest recored high temperature was 63.1 °F (17.3 °C) in 2019 and the highest recored high temperature was 92.7 °F (33.7 °C) in 2022. The high temperature is usually* between 74.9 °F (23.8 °C) and 87.8 °F (31.0 °C). About a quarter of the time, the high temperature is less than 74.9 °F (23.8 °C), and another quarter of the time, the high temperature is greater than and 87.8 °F (31.0 °C). About 95% of the time, the high temperature has been between 62.6 °F (17.0 °C) and 100.1 °F (37.8 °C).
Low Temperatures
On June 20 in NORTHERLY ISLAND the average low temperature is 62.0 °F (16.7 °C). The lowest recored low temperature was 50.0 °F (10.0 °C) in 2015 and the lowest recored low temperature was 69.4 °F (20.8 °C) in 2020. The low temperature is usually* between 57.7 °F (14.3 °C) and 66.3 °F (19.1 °C). About a quarter of the time, the low temperature is less than 57.7 °F (14.3 °C), and another quarter of the time, the low temperature is greater than and 66.3 °F (19.1 °C). About 95% of the time, the low temperature has been between 49.6 °F (9.8 °C) and 74.5 °F (23.6 °C).
Frost
On June 20 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 0.0% 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 2013 to 2025