- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On December 18 in NORTHERLY ISLAND the average high temperature is 37.4 °F (3.0 °C). The lowest recored high temperature was 26.1 °F (-3.3 °C) in 2016 and the highest recored high temperature was 45.0 °F (7.2 °C) in 2017. The high temperature is usually* between 32.2 °F (0.1 °C) and 42.6 °F (5.9 °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 42.6 °F (5.9 °C). About 95% of the time, the high temperature has been between 22.3 °F (-5.4 °C) and 52.5 °F (11.4 °C).
Low Temperatures
On December 18 in NORTHERLY ISLAND the average low temperature is 25.0 °F (-3.9 °C). The lowest recored low temperature was 7.5 °F (-13.6 °C) in 2016 and the lowest recored low temperature was 34.0 °F (1.1 °C) in 2017. The low temperature is usually* between 18.6 °F (-7.5 °C) and 31.5 °F (-0.3 °C). About a quarter of the time, the low temperature is less than 18.6 °F (-7.5 °C), and another quarter of the time, the low temperature is greater than and 31.5 °F (-0.3 °C). About 95% of the time, the low temperature has been between 6.3 °F (-14.3 °C) and 43.7 °F (6.5 °C).
Frost
On December 18 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 76.8% 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