Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On June 25 in NORTHERLY ISLAND the average high temperature is 79.9 °F (26.6 °C). The lowest recored high temperature was 70.0 °F (21.1 °C) in 2012 and the highest recored high temperature was 91.9 °F (33.3 °C) in 2025. The high temperature is usually* between 75.5 °F (24.1 °C) and 84.4 °F (29.1 °C). About a quarter of the time, the high temperature is less than 75.5 °F (24.1 °C), and another quarter of the time, the high temperature is greater than and 84.4 °F (29.1 °C). About 95% of the time, the high temperature has been between 67.0 °F (19.4 °C) and 92.9 °F (33.8 °C).
Low Temperatures
On June 25 in NORTHERLY ISLAND the average low temperature is 64.4 °F (18.0 °C). The lowest recored low temperature was 59.2 °F (15.1 °C) in 2014 and the lowest recored low temperature was 68.0 °F (20.0 °C) in 2024. The low temperature is usually* between 62.1 °F (16.7 °C) and 66.6 °F (19.2 °C). About a quarter of the time, the low temperature is less than 62.1 °F (16.7 °C), and another quarter of the time, the low temperature is greater than and 66.6 °F (19.2 °C). About 95% of the time, the low temperature has been between 57.8 °F (14.4 °C) and 70.9 °F (21.6 °C).
Frost
On June 25 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 2012 to 2025