- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On July 25 in NORTHERLY ISLAND the average high temperature is 82.9 °F (28.3 °C). The lowest recored high temperature was 73.2 °F (22.9 °C) in 2014 and the highest recored high temperature was 98.6 °F (37.0 °C) in 2012. The high temperature is usually* between 77.4 °F (25.2 °C) and 88.3 °F (31.3 °C). About a quarter of the time, the high temperature is less than 77.4 °F (25.2 °C), and another quarter of the time, the high temperature is greater than and 88.3 °F (31.3 °C). About 95% of the time, the high temperature has been between 66.9 °F (19.4 °C) and 98.8 °F (37.1 °C).
Low Temperatures
On July 25 in NORTHERLY ISLAND the average low temperature is 69.0 °F (20.5 °C). The lowest recored low temperature was 63.7 °F (17.6 °C) in 2013 and the lowest recored low temperature was 73.4 °F (23.0 °C) in 2021. The low temperature is usually* between 66.4 °F (19.1 °C) and 71.5 °F (22.0 °C). About a quarter of the time, the low temperature is less than 66.4 °F (19.1 °C), and another quarter of the time, the low temperature is greater than and 71.5 °F (22.0 °C). About 95% of the time, the low temperature has been between 61.6 °F (16.4 °C) and 76.4 °F (24.6 °C).
Frost
On July 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