Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On April 4 in NORTHERLY ISLAND the average high temperature is 52.5 °F (11.4 °C). The lowest recored high temperature was 39.0 °F (3.9 °C) in 2018 and the highest recored high temperature was 70.9 °F (21.6 °C) in 2016. The high temperature is usually* between 45.7 °F (7.6 °C) and 59.3 °F (15.2 °C). About a quarter of the time, the high temperature is less than 45.7 °F (7.6 °C), and another quarter of the time, the high temperature is greater than and 59.3 °F (15.2 °C). About 95% of the time, the high temperature has been between 32.8 °F (0.4 °C) and 72.2 °F (22.4 °C).
Low Temperatures
On April 4 in NORTHERLY ISLAND the average low temperature is 35.6 °F (2.0 °C). The lowest recored low temperature was 27.1 °F (-2.7 °C) in 2018 and the lowest recored low temperature was 41.4 °F (5.2 °C) in 2025. The low temperature is usually* between 32.5 °F (0.3 °C) and 38.7 °F (3.7 °C). About a quarter of the time, the low temperature is less than 32.5 °F (0.3 °C), and another quarter of the time, the low temperature is greater than and 38.7 °F (3.7 °C). About 95% of the time, the low temperature has been between 26.7 °F (-2.9 °C) and 44.5 °F (6.9 °C).
Frost
On April 4 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 21.4% 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