- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On July 15 in NORTHERLY ISLAND the average high temperature is 82.8 °F (28.2 °C). The lowest recored high temperature was 72.5 °F (22.5 °C) in 2014 and the highest recored high temperature was 89.4 °F (31.9 °C) in 2019. The high temperature is usually* between 78.4 °F (25.8 °C) and 87.2 °F (30.7 °C). About a quarter of the time, the high temperature is less than 78.4 °F (25.8 °C), and another quarter of the time, the high temperature is greater than and 87.2 °F (30.7 °C). About 95% of the time, the high temperature has been between 70.0 °F (21.1 °C) and 95.6 °F (35.3 °C).
Low Temperatures
On July 15 in NORTHERLY ISLAND the average low temperature is 67.6 °F (19.8 °C). The lowest recored low temperature was 57.2 °F (14.0 °C) in 2014 and the lowest recored low temperature was 73.0 °F (22.8 °C) in 2013. The low temperature is usually* between 64.6 °F (18.1 °C) and 70.6 °F (21.5 °C). About a quarter of the time, the low temperature is less than 64.6 °F (18.1 °C), and another quarter of the time, the low temperature is greater than and 70.6 °F (21.5 °C). About 95% of the time, the low temperature has been between 58.8 °F (14.9 °C) and 76.4 °F (24.7 °C).
Frost
On July 15 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