- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On December 17 in NORTHERLY ISLAND the average high temperature is 39.5 °F (4.2 °C). The lowest recored high temperature was 25.7 °F (-3.5 °C) in 2016 and the highest recored high temperature was 54.0 °F (12.2 °C) in 2015. The high temperature is usually* between 32.6 °F (0.3 °C) and 46.4 °F (8.0 °C). About a quarter of the time, the high temperature is less than 32.6 °F (0.3 °C), and another quarter of the time, the high temperature is greater than and 46.4 °F (8.0 °C). About 95% of the time, the high temperature has been between 19.5 °F (-6.9 °C) and 59.4 °F (15.2 °C).
Low Temperatures
On December 17 in NORTHERLY ISLAND the average low temperature is 26.8 °F (-2.9 °C). The lowest recored low temperature was 10.0 °F (-12.2 °C) in 2016 and the lowest recored low temperature was 39.9 °F (4.4 °C) in 2023. The low temperature is usually* between 20.3 °F (-6.5 °C) and 33.4 °F (0.8 °C). About a quarter of the time, the low temperature is less than 20.3 °F (-6.5 °C), and another quarter of the time, the low temperature is greater than and 33.4 °F (0.8 °C). About 95% of the time, the low temperature has been between 7.8 °F (-13.5 °C) and 45.9 °F (7.7 °C).
Frost
On December 17 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 70.2% 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