Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On August 8 in NORTHERLY ISLAND the average high temperature is 82.6 °F (28.1 °C). The lowest recored high temperature was 73.9 °F (23.3 °C) in 2013 and the highest recored high temperature was 90.0 °F (32.2 °C) in 2025. The high temperature is usually* between 78.5 °F (25.9 °C) and 86.7 °F (30.4 °C). About a quarter of the time, the high temperature is less than 78.5 °F (25.9 °C), and another quarter of the time, the high temperature is greater than and 86.7 °F (30.4 °C). About 95% of the time, the high temperature has been between 70.7 °F (21.5 °C) and 94.5 °F (34.7 °C).
Low Temperatures
On August 8 in NORTHERLY ISLAND the average low temperature is 68.9 °F (20.5 °C). The lowest recored low temperature was 64.4 °F (18.0 °C) in 2022 and the lowest recored low temperature was 74.3 °F (23.5 °C) in 2012. The low temperature is usually* between 66.9 °F (19.4 °C) and 70.9 °F (21.6 °C). About a quarter of the time, the low temperature is less than 66.9 °F (19.4 °C), and another quarter of the time, the low temperature is greater than and 70.9 °F (21.6 °C). About 95% of the time, the low temperature has been between 63.2 °F (17.3 °C) and 74.6 °F (23.7 °C).
Frost
On August 8 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