Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On March 29 in NORTHERLY ISLAND the average high temperature is 52.3 °F (11.3 °C). The lowest recored high temperature was 34.9 °F (1.6 °C) in 2014 and the highest recored high temperature was 78.1 °F (25.6 °C) in 2025. The high temperature is usually* between 44.2 °F (6.8 °C) and 60.4 °F (15.8 °C). About a quarter of the time, the high temperature is less than 44.2 °F (6.8 °C), and another quarter of the time, the high temperature is greater than and 60.4 °F (15.8 °C). About 95% of the time, the high temperature has been between 28.8 °F (-1.8 °C) and 75.7 °F (24.3 °C).
Low Temperatures
On March 29 in NORTHERLY ISLAND the average low temperature is 34.5 °F (1.4 °C). The lowest recored low temperature was 24.1 °F (-4.4 °C) in 2015 and the lowest recored low temperature was 43.5 °F (6.4 °C) in 2020. The low temperature is usually* between 31.0 °F (-0.6 °C) and 38.0 °F (3.3 °C). About a quarter of the time, the low temperature is less than 31.0 °F (-0.6 °C), and another quarter of the time, the low temperature is greater than and 38.0 °F (3.3 °C). About 95% of the time, the low temperature has been between 24.3 °F (-4.3 °C) and 44.6 °F (7.0 °C).
Frost
On March 29 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 31.7% 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