- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On July 28 in NORTHERLY ISLAND the average high temperature is 82.0 °F (27.8 °C). The lowest recored high temperature was 68.4 °F (20.2 °C) in 2013 and the highest recored high temperature was 88.2 °F (31.2 °C) in 2019. The high temperature is usually* between 78.0 °F (25.6 °C) and 86.1 °F (30.0 °C). About a quarter of the time, the high temperature is less than 78.0 °F (25.6 °C), and another quarter of the time, the high temperature is greater than and 86.1 °F (30.0 °C). About 95% of the time, the high temperature has been between 70.3 °F (21.3 °C) and 93.8 °F (34.3 °C).
Low Temperatures
On July 28 in NORTHERLY ISLAND the average low temperature is 69.1 °F (20.6 °C). The lowest recored low temperature was 56.1 °F (13.4 °C) in 2013 and the lowest recored low temperature was 75.0 °F (23.9 °C) in 2025. The low temperature is usually* between 65.9 °F (18.9 °C) and 72.2 °F (22.4 °C). About a quarter of the time, the low temperature is less than 65.9 °F (18.9 °C), and another quarter of the time, the low temperature is greater than and 72.2 °F (22.4 °C). About 95% of the time, the low temperature has been between 60.0 °F (15.5 °C) and 78.2 °F (25.7 °C).
Frost
On July 28 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