- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On April 11 in NORTHERLY ISLAND the average high temperature is 58.2 °F (14.5 °C). The lowest recored high temperature was 43.7 °F (6.5 °C) in 2025 and the highest recored high temperature was 76.6 °F (24.8 °C) in 2023. The high temperature is usually* between 50.7 °F (10.4 °C) and 65.7 °F (18.7 °C). About a quarter of the time, the high temperature is less than 50.7 °F (10.4 °C), and another quarter of the time, the high temperature is greater than and 65.7 °F (18.7 °C). About 95% of the time, the high temperature has been between 36.4 °F (2.4 °C) and 79.9 °F (26.6 °C).
Low Temperatures
On April 11 in NORTHERLY ISLAND the average low temperature is 40.3 °F (4.6 °C). The lowest recored low temperature was 32.0 °F (0.0 °C) in 2018 and the lowest recored low temperature was 48.9 °F (9.4 °C) in 2022. The low temperature is usually* between 35.7 °F (2.1 °C) and 45.0 °F (7.2 °C). About a quarter of the time, the low temperature is less than 35.7 °F (2.1 °C), and another quarter of the time, the low temperature is greater than and 45.0 °F (7.2 °C). About 95% of the time, the low temperature has been between 26.9 °F (-2.8 °C) and 53.8 °F (12.1 °C).
Frost
On April 11 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 11.2% 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