- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On March 15 in NORTHERLY ISLAND the average high temperature is 50.3 °F (10.2 °C). The lowest recored high temperature was 32.9 °F (0.5 °C) in 2017 and the highest recored high temperature was 77.0 °F (25.0 °C) in 2025. The high temperature is usually* between 41.4 °F (5.2 °C) and 59.2 °F (15.1 °C). About a quarter of the time, the high temperature is less than 41.4 °F (5.2 °C), and another quarter of the time, the high temperature is greater than and 59.2 °F (15.1 °C). About 95% of the time, the high temperature has been between 24.4 °F (-4.2 °C) and 76.2 °F (24.5 °C).
Low Temperatures
On March 15 in NORTHERLY ISLAND the average low temperature is 31.8 °F (-0.1 °C). The lowest recored low temperature was 20.1 °F (-6.6 °C) in 2017 and the lowest recored low temperature was 42.1 °F (5.6 °C) in 2025. The low temperature is usually* between 27.4 °F (-2.5 °C) and 36.2 °F (2.4 °C). About a quarter of the time, the low temperature is less than 27.4 °F (-2.5 °C), and another quarter of the time, the low temperature is greater than and 36.2 °F (2.4 °C). About 95% of the time, the low temperature has been between 19.1 °F (-7.2 °C) and 44.6 °F (7.0 °C).
Frost
On March 15 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 51.0% 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