- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On February 20 in NORTHERLY ISLAND the average high temperature is 42.1 °F (5.6 °C). The lowest recored high temperature was 17.1 °F (-8.3 °C) in 2015 and the highest recored high temperature was 64.9 °F (18.3 °C) in 2018. The high temperature is usually* between 32.2 °F (0.1 °C) and 52.0 °F (11.1 °C). About a quarter of the time, the high temperature is less than 32.2 °F (0.1 °C), and another quarter of the time, the high temperature is greater than and 52.0 °F (11.1 °C). About 95% of the time, the high temperature has been between 13.3 °F (-10.4 °C) and 70.9 °F (21.6 °C).
Low Temperatures
On February 20 in NORTHERLY ISLAND the average low temperature is 21.5 °F (-5.8 °C). The lowest recored low temperature was -4.0 °F (-20.0 °C) in 2015 and the lowest recored low temperature was 39.9 °F (4.4 °C) in 2016. The low temperature is usually* between 13.1 °F (-10.5 °C) and 29.9 °F (-1.2 °C). About a quarter of the time, the low temperature is less than 13.1 °F (-10.5 °C), and another quarter of the time, the low temperature is greater than and 29.9 °F (-1.2 °C). About 95% of the time, the low temperature has been between -2.8 °F (-19.3 °C) and 45.8 °F (7.7 °C).
Frost
On February 20 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 80.1% 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