Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On July 31 in NORTHERLY ISLAND the average high temperature is 80.3 °F (26.9 °C). The lowest recored high temperature was 71.1 °F (21.7 °C) in 2013 and the highest recored high temperature was 87.8 °F (31.0 °C) in 2012. The high temperature is usually* between 76.5 °F (24.7 °C) and 84.2 °F (29.0 °C). About a quarter of the time, the high temperature is less than 76.5 °F (24.7 °C), and another quarter of the time, the high temperature is greater than and 84.2 °F (29.0 °C). About 95% of the time, the high temperature has been between 69.2 °F (20.7 °C) and 91.5 °F (33.1 °C).
Low Temperatures
On July 31 in NORTHERLY ISLAND the average low temperature is 68.5 °F (20.3 °C). The lowest recored low temperature was 63.9 °F (17.7 °C) in 2014 and the lowest recored low temperature was 73.0 °F (22.8 °C) in 2012. The low temperature is usually* between 66.3 °F (19.0 °C) and 70.8 °F (21.5 °C). About a quarter of the time, the low temperature is less than 66.3 °F (19.0 °C), and another quarter of the time, the low temperature is greater than and 70.8 °F (21.5 °C). About 95% of the time, the low temperature has been between 62.0 °F (16.7 °C) and 75.1 °F (23.9 °C).
Frost
On July 31 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