- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On June 18 in NORTHERLY ISLAND the average high temperature is 79.5 °F (26.4 °C). The lowest recored high temperature was 62.4 °F (16.9 °C) in 2019 and the highest recored high temperature was 93.9 °F (34.4 °C) in 2024. The high temperature is usually* between 72.8 °F (22.7 °C) and 86.1 °F (30.1 °C). About a quarter of the time, the high temperature is less than 72.8 °F (22.7 °C), and another quarter of the time, the high temperature is greater than and 86.1 °F (30.1 °C). About 95% of the time, the high temperature has been between 60.1 °F (15.6 °C) and 98.8 °F (37.1 °C).
Low Temperatures
On June 18 in NORTHERLY ISLAND the average low temperature is 61.3 °F (16.3 °C). The lowest recored low temperature was 53.1 °F (11.7 °C) in 2019 and the lowest recored low temperature was 72.9 °F (22.7 °C) in 2024. The low temperature is usually* between 57.1 °F (14.0 °C) and 65.5 °F (18.6 °C). About a quarter of the time, the low temperature is less than 57.1 °F (14.0 °C), and another quarter of the time, the low temperature is greater than and 65.5 °F (18.6 °C). About 95% of the time, the low temperature has been between 49.2 °F (9.5 °C) and 73.5 °F (23.0 °C).
Frost
On June 18 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