Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On February 25 in NORTHERLY ISLAND the average high temperature is 41.2 °F (5.1 °C). The lowest recored high temperature was 22.8 °F (-5.1 °C) in 2014 and the highest recored high temperature was 58.8 °F (14.9 °C) in 2024. The high temperature is usually* between 33.3 °F (0.7 °C) and 49.1 °F (9.5 °C). About a quarter of the time, the high temperature is less than 33.3 °F (0.7 °C), and another quarter of the time, the high temperature is greater than and 49.1 °F (9.5 °C). About 95% of the time, the high temperature has been between 18.3 °F (-7.6 °C) and 64.1 °F (17.8 °C).
Low Temperatures
On February 25 in NORTHERLY ISLAND the average low temperature is 25.1 °F (-3.8 °C). The lowest recored low temperature was 7.0 °F (-13.9 °C) in 2015 and the lowest recored low temperature was 37.9 °F (3.3 °C) in 2025. The low temperature is usually* between 18.9 °F (-7.3 °C) and 31.3 °F (-0.4 °C). About a quarter of the time, the low temperature is less than 18.9 °F (-7.3 °C), and another quarter of the time, the low temperature is greater than and 31.3 °F (-0.4 °C). About 95% of the time, the low temperature has been between 7.2 °F (-13.8 °C) and 43.0 °F (6.1 °C).
Frost
On February 25 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 77.5% 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