Station information
- Integrated Surface Dataset (ISD) station ID: 998499
- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On September 30 in NORTHERLY ISLAND the average high temperature is 69.7 °F (20.9 °C). The lowest recored high temperature was 61.0 °F (16.1 °C) in 2014 and the highest recored high temperature was 86.2 °F (30.1 °C) in 2019. The high temperature is usually* between 65.0 °F (18.3 °C) and 74.4 °F (23.5 °C). About a quarter of the time, the high temperature is less than 65.0 °F (18.3 °C), and another quarter of the time, the high temperature is greater than and 74.4 °F (23.5 °C). About 95% of the time, the high temperature has been between 56.0 °F (13.4 °C) and 83.3 °F (28.5 °C).
Low Temperatures
On September 30 in NORTHERLY ISLAND the average low temperature is 57.0 °F (13.9 °C). The lowest recored low temperature was 48.0 °F (8.9 °C) in 2020 and the lowest recored low temperature was 65.8 °F (18.8 °C) in 2024. The low temperature is usually* between 53.8 °F (12.1 °C) and 60.2 °F (15.7 °C). About a quarter of the time, the low temperature is less than 53.8 °F (12.1 °C), and another quarter of the time, the low temperature is greater than and 60.2 °F (15.7 °C). About 95% of the time, the low temperature has been between 47.8 °F (8.8 °C) and 66.3 °F (19.0 °C).
Frost
On September 30 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 0.0% 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 2012 to 2024