- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On July 29 in NORTHERLY ISLAND the average high temperature is 81.7 °F (27.6 °C). The lowest recored high temperature was 68.7 °F (20.4 °C) in 2013 and the highest recored high temperature was 90.9 °F (32.7 °C) in 2025. The high temperature is usually* between 77.4 °F (25.2 °C) and 86.0 °F (30.0 °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 86.0 °F (30.0 °C). About 95% of the time, the high temperature has been between 69.2 °F (20.7 °C) and 94.2 °F (34.6 °C).
Low Temperatures
On July 29 in NORTHERLY ISLAND the average low temperature is 68.9 °F (20.5 °C). The lowest recored low temperature was 60.6 °F (15.9 °C) in 2013 and the lowest recored low temperature was 73.0 °F (22.8 °C) in 2021. The low temperature is usually* between 65.7 °F (18.7 °C) and 72.0 °F (22.2 °C). About a quarter of the time, the low temperature is less than 65.7 °F (18.7 °C), and another quarter of the time, the low temperature is greater than and 72.0 °F (22.2 °C). About 95% of the time, the low temperature has been between 59.8 °F (15.4 °C) and 77.9 °F (25.5 °C).
Frost
On July 29 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