- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On August 13 in NORTHERLY ISLAND the average high temperature is 79.3 °F (26.3 °C). The lowest recored high temperature was 71.8 °F (22.1 °C) in 2013 and the highest recored high temperature was 84.9 °F (29.4 °C) in 2021. The high temperature is usually* between 75.3 °F (24.1 °C) and 83.2 °F (28.5 °C). About a quarter of the time, the high temperature is less than 75.3 °F (24.1 °C), and another quarter of the time, the high temperature is greater than and 83.2 °F (28.5 °C). About 95% of the time, the high temperature has been between 67.8 °F (19.9 °C) and 90.7 °F (32.6 °C).
Low Temperatures
On August 13 in NORTHERLY ISLAND the average low temperature is 67.4 °F (19.7 °C). The lowest recored low temperature was 62.6 °F (17.0 °C) in 2014 and the lowest recored low temperature was 72.7 °F (22.6 °C) in 2021. The low temperature is usually* between 65.3 °F (18.5 °C) and 69.6 °F (20.9 °C). About a quarter of the time, the low temperature is less than 65.3 °F (18.5 °C), and another quarter of the time, the low temperature is greater than and 69.6 °F (20.9 °C). About 95% of the time, the low temperature has been between 61.1 °F (16.2 °C) and 73.8 °F (23.2 °C).
Frost
On August 13 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