- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On June 15 in NORTHERLY ISLAND the average high temperature is 78.3 °F (25.7 °C). The lowest recored high temperature was 66.2 °F (19.0 °C) in 2020 and the highest recored high temperature was 96.1 °F (35.6 °C) in 2022. The high temperature is usually* between 71.7 °F (22.1 °C) and 84.9 °F (29.4 °C). About a quarter of the time, the high temperature is less than 71.7 °F (22.1 °C), and another quarter of the time, the high temperature is greater than and 84.9 °F (29.4 °C). About 95% of the time, the high temperature has been between 59.2 °F (15.1 °C) and 97.4 °F (36.3 °C).
Low Temperatures
On June 15 in NORTHERLY ISLAND the average low temperature is 60.1 °F (15.6 °C). The lowest recored low temperature was 54.0 °F (12.2 °C) in 2019 and the lowest recored low temperature was 66.7 °F (19.3 °C) in 2021. The low temperature is usually* between 56.6 °F (13.7 °C) and 63.6 °F (17.6 °C). About a quarter of the time, the low temperature is less than 56.6 °F (13.7 °C), and another quarter of the time, the low temperature is greater than and 63.6 °F (17.6 °C). About 95% of the time, the low temperature has been between 49.9 °F (10.0 °C) and 70.3 °F (21.3 °C).
Frost
On June 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 2013 to 2025