- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On August 11 in NORTHERLY ISLAND the average high temperature is 80.9 °F (27.2 °C). The lowest recored high temperature was 73.0 °F (22.8 °C) in 2012 and the highest recored high temperature was 91.2 °F (32.9 °C) in 2016. The high temperature is usually* between 76.4 °F (24.7 °C) and 85.4 °F (29.7 °C). About a quarter of the time, the high temperature is less than 76.4 °F (24.7 °C), and another quarter of the time, the high temperature is greater than and 85.4 °F (29.7 °C). About 95% of the time, the high temperature has been between 67.9 °F (20.0 °C) and 93.9 °F (34.4 °C).
Low Temperatures
On August 11 in NORTHERLY ISLAND the average low temperature is 67.9 °F (19.9 °C). The lowest recored low temperature was 59.7 °F (15.4 °C) in 2012 and the lowest recored low temperature was 79.2 °F (26.2 °C) in 2021. The low temperature is usually* between 64.7 °F (18.2 °C) and 71.0 °F (21.7 °C). About a quarter of the time, the low temperature is less than 64.7 °F (18.2 °C), and another quarter of the time, the low temperature is greater than and 71.0 °F (21.7 °C). About 95% of the time, the low temperature has been between 58.6 °F (14.8 °C) and 77.1 °F (25.0 °C).
Frost
On August 11 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