- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On January 20 in NORTHERLY ISLAND the average high temperature is 32.9 °F (0.5 °C). The lowest recored high temperature was 17.6 °F (-8.0 °C) in 2019 and the highest recored high temperature was 46.2 °F (7.9 °C) in 2013. The high temperature is usually* between 25.6 °F (-3.6 °C) and 40.3 °F (4.6 °C). About a quarter of the time, the high temperature is less than 25.6 °F (-3.6 °C), and another quarter of the time, the high temperature is greater than and 40.3 °F (4.6 °C). About 95% of the time, the high temperature has been between 11.6 °F (-11.3 °C) and 54.3 °F (12.4 °C).
Low Temperatures
On January 20 in NORTHERLY ISLAND the average low temperature is 17.4 °F (-8.1 °C). The lowest recored low temperature was -0.2 °F (-17.9 °C) in 2025 and the lowest recored low temperature was 34.0 °F (1.1 °C) in 2017. The low temperature is usually* between 8.9 °F (-12.9 °C) and 25.9 °F (-3.4 °C). About a quarter of the time, the low temperature is less than 8.9 °F (-12.9 °C), and another quarter of the time, the low temperature is greater than and 25.9 °F (-3.4 °C). About 95% of the time, the low temperature has been between -7.3 °F (-21.8 °C) and 42.1 °F (5.6 °C).
Frost
On January 20 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 87.7% 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