- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On December 21 in NORTHERLY ISLAND the average high temperature is 40.4 °F (4.7 °C). The lowest recored high temperature was 30.0 °F (-1.1 °C) in 2016 and the highest recored high temperature was 53.8 °F (12.1 °C) in 2015. The high temperature is usually* between 35.7 °F (2.1 °C) and 45.1 °F (7.3 °C). About a quarter of the time, the high temperature is less than 35.7 °F (2.1 °C), and another quarter of the time, the high temperature is greater than and 45.1 °F (7.3 °C). About 95% of the time, the high temperature has been between 26.8 °F (-2.9 °C) and 54.0 °F (12.2 °C).
Low Temperatures
On December 21 in NORTHERLY ISLAND the average low temperature is 26.4 °F (-3.1 °C). The lowest recored low temperature was 16.0 °F (-8.9 °C) in 2016 and the lowest recored low temperature was 32.0 °F (0.0 °C) in 2020. The low temperature is usually* between 20.4 °F (-6.5 °C) and 32.3 °F (0.2 °C). About a quarter of the time, the low temperature is less than 20.4 °F (-6.5 °C), and another quarter of the time, the low temperature is greater than and 32.3 °F (0.2 °C). About 95% of the time, the low temperature has been between 9.0 °F (-12.8 °C) and 43.7 °F (6.5 °C).
Frost
On December 21 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 73.8% 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 2012 to 2024