- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On February 28 in NORTHERLY ISLAND the average high temperature is 45.2 °F (7.3 °C). The lowest recored high temperature was 21.2 °F (-6.0 °C) in 2015 and the highest recored high temperature was 62.4 °F (16.9 °C) in 2016. The high temperature is usually* between 35.3 °F (1.8 °C) and 55.0 °F (12.8 °C). About a quarter of the time, the high temperature is less than 35.3 °F (1.8 °C), and another quarter of the time, the high temperature is greater than and 55.0 °F (12.8 °C). About 95% of the time, the high temperature has been between 16.6 °F (-8.6 °C) and 73.8 °F (23.2 °C).
Low Temperatures
On February 28 in NORTHERLY ISLAND the average low temperature is 26.1 °F (-3.3 °C). The lowest recored low temperature was 5.7 °F (-14.6 °C) in 2015 and the lowest recored low temperature was 36.5 °F (2.5 °C) in 2025. The low temperature is usually* between 19.5 °F (-7.0 °C) and 32.8 °F (0.4 °C). About a quarter of the time, the low temperature is less than 19.5 °F (-7.0 °C), and another quarter of the time, the low temperature is greater than and 32.8 °F (0.4 °C). About 95% of the time, the low temperature has been between 6.8 °F (-14.0 °C) and 45.4 °F (7.5 °C).
Frost
On February 28 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 72.5% 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