Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On March 30 in NORTHERLY ISLAND the average high temperature is 53.7 °F (12.1 °C). The lowest recored high temperature was 42.4 °F (5.8 °C) in 2023 and the highest recored high temperature was 73.2 °F (22.9 °C) in 2025. The high temperature is usually* between 46.6 °F (8.1 °C) and 60.8 °F (16.0 °C). About a quarter of the time, the high temperature is less than 46.6 °F (8.1 °C), and another quarter of the time, the high temperature is greater than and 60.8 °F (16.0 °C). About 95% of the time, the high temperature has been between 33.0 °F (0.6 °C) and 74.4 °F (23.5 °C).
Low Temperatures
On March 30 in NORTHERLY ISLAND the average low temperature is 35.1 °F (1.7 °C). The lowest recored low temperature was 28.0 °F (-2.2 °C) in 2015 and the lowest recored low temperature was 39.9 °F (4.4 °C) in 2025. The low temperature is usually* between 31.5 °F (-0.3 °C) and 38.7 °F (3.7 °C). About a quarter of the time, the low temperature is less than 31.5 °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 24.6 °F (-4.1 °C) and 45.6 °F (7.5 °C).
Frost
On March 30 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 28.2% 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