- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On March 21 in NORTHERLY ISLAND the average high temperature is 48.9 °F (9.4 °C). The lowest recored high temperature was 30.4 °F (-0.9 °C) in 2013 and the highest recored high temperature was 72.3 °F (22.4 °C) in 2022. The high temperature is usually* between 41.2 °F (5.1 °C) and 56.5 °F (13.6 °C). About a quarter of the time, the high temperature is less than 41.2 °F (5.1 °C), and another quarter of the time, the high temperature is greater than and 56.5 °F (13.6 °C). About 95% of the time, the high temperature has been between 26.7 °F (-2.9 °C) and 71.1 °F (21.7 °C).
Low Temperatures
On March 21 in NORTHERLY ISLAND the average low temperature is 31.1 °F (-0.5 °C). The lowest recored low temperature was 16.9 °F (-8.4 °C) in 2013 and the lowest recored low temperature was 40.1 °F (4.5 °C) in 2022. The low temperature is usually* between 27.3 °F (-2.6 °C) and 35.0 °F (1.6 °C). About a quarter of the time, the low temperature is less than 27.3 °F (-2.6 °C), and another quarter of the time, the low temperature is greater than and 35.0 °F (1.6 °C). About 95% of the time, the low temperature has been between 20.1 °F (-6.6 °C) and 42.2 °F (5.7 °C).
Frost
On March 21 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 56.1% 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