- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On February 15 in NORTHERLY ISLAND the average high temperature is 35.2 °F (1.8 °C). The lowest recored high temperature was 16.9 °F (-8.4 °C) in 2021 and the highest recored high temperature was 54.0 °F (12.2 °C) in 2023. The high temperature is usually* between 27.6 °F (-2.4 °C) and 42.7 °F (5.9 °C). About a quarter of the time, the high temperature is less than 27.6 °F (-2.4 °C), and another quarter of the time, the high temperature is greater than and 42.7 °F (5.9 °C). About 95% of the time, the high temperature has been between 13.3 °F (-10.4 °C) and 57.0 °F (13.9 °C).
Low Temperatures
On February 15 in NORTHERLY ISLAND the average low temperature is 17.1 °F (-8.3 °C). The lowest recored low temperature was -2.9 °F (-19.4 °C) in 2021 and the lowest recored low temperature was 36.0 °F (2.2 °C) in 2023. The low temperature is usually* between 9.1 °F (-12.7 °C) and 25.1 °F (-3.9 °C). About a quarter of the time, the low temperature is less than 9.1 °F (-12.7 °C), and another quarter of the time, the low temperature is greater than and 25.1 °F (-3.9 °C). About 95% of the time, the low temperature has been between -6.1 °F (-21.2 °C) and 40.3 °F (4.6 °C).
Frost
On February 15 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 89.6% 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