- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On June 21 in NORTHERLY ISLAND the average high temperature is 82.4 °F (28.0 °C). The lowest recored high temperature was 64.9 °F (18.3 °C) in 2019 and the highest recored high temperature was 96.6 °F (35.9 °C) in 2022. The high temperature is usually* between 76.0 °F (24.5 °C) and 88.7 °F (31.5 °C). About a quarter of the time, the high temperature is less than 76.0 °F (24.5 °C), and another quarter of the time, the high temperature is greater than and 88.7 °F (31.5 °C). About 95% of the time, the high temperature has been between 64.0 °F (17.8 °C) and 100.8 °F (38.2 °C).
Low Temperatures
On June 21 in NORTHERLY ISLAND the average low temperature is 63.6 °F (17.6 °C). The lowest recored low temperature was 54.0 °F (12.2 °C) in 2019 and the lowest recored low temperature was 70.0 °F (21.1 °C) in 2016. The low temperature is usually* between 59.4 °F (15.2 °C) and 67.8 °F (19.9 °C). About a quarter of the time, the low temperature is less than 59.4 °F (15.2 °C), and another quarter of the time, the low temperature is greater than and 67.8 °F (19.9 °C). About 95% of the time, the low temperature has been between 51.3 °F (10.7 °C) and 75.9 °F (24.4 °C).
Frost
On June 21 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