Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On April 15 in NORTHERLY ISLAND the average high temperature is 58.3 °F (14.6 °C). The lowest recored high temperature was 34.0 °F (1.1 °C) in 2014 and the highest recored high temperature was 79.7 °F (26.5 °C) in 2017. The high temperature is usually* between 49.5 °F (9.7 °C) and 67.0 °F (19.5 °C). About a quarter of the time, the high temperature is less than 49.5 °F (9.7 °C), and another quarter of the time, the high temperature is greater than and 67.0 °F (19.5 °C). About 95% of the time, the high temperature has been between 32.9 °F (0.5 °C) and 83.7 °F (28.7 °C).
Low Temperatures
On April 15 in NORTHERLY ISLAND the average low temperature is 39.5 °F (4.1 °C). The lowest recored low temperature was 27.5 °F (-2.5 °C) in 2020 and the lowest recored low temperature was 53.1 °F (11.7 °C) in 2023. The low temperature is usually* between 34.6 °F (1.5 °C) and 44.3 °F (6.8 °C). About a quarter of the time, the low temperature is less than 34.6 °F (1.5 °C), and another quarter of the time, the low temperature is greater than and 44.3 °F (6.8 °C). About 95% of the time, the low temperature has been between 25.4 °F (-3.7 °C) and 53.5 °F (12.0 °C).
Frost
On April 15 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 14.9% 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