September 11 - NORTHERLY ISLAND - Weather History and Averages

Station: NORTHERLY ISLAND (2012 to 2025)
Country: US
State: IL
Latitude: 41.856
Longitude: -87.609

High Temperatures

On September 11 in NORTHERLY ISLAND the average high temperature is 78.4 °F (25.8 °C). The lowest recored high temperature was 66.4 °F (19.1 °C) in 2020 and the highest recored high temperature was 91.8 °F (33.2 °C) in 2013. The high temperature is usually^* between 72.7 °F (22.6 °C) and 84.1 °F (29.0 °C). About a quarter of the time, the high temperature is less than 72.7 °F (22.6 °C), and another quarter of the time, the high temperature is greater than and 84.1 °F (29.0 °C). About 95% of the time, the high temperature has been between 61.8 °F (16.5 °C) and 95.0 °F (35.0 °C).

Low Temperatures

On September 11 in NORTHERLY ISLAND the average low temperature is 62.6 °F (17.0 °C). The lowest recored low temperature was 50.5 °F (10.3 °C) in 2014 and the lowest recored low temperature was 76.1 °F (24.5 °C) in 2013. The low temperature is usually^* between 58.4 °F (14.7 °C) and 66.8 °F (19.3 °C). About a quarter of the time, the low temperature is less than 58.4 °F (14.7 °C), and another quarter of the time, the low temperature is greater than and 66.8 °F (19.3 °C). About 95% of the time, the low temperature has been between 50.4 °F (10.2 °C) and 74.8 °F (23.8 °C).

Frost

On September 11 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

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

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