July 21 - 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 July 21 in NORTHERLY ISLAND the average high temperature is 83.0 °F (28.3 °C). The lowest recored high temperature was 77.0 °F (25.0 °C) in 2025 and the highest recored high temperature was 95.0 °F (35.0 °C) in 2019. The high temperature is usually^* between 79.1 °F (26.2 °C) and 86.9 °F (30.5 °C). About a quarter of the time, the high temperature is less than 79.1 °F (26.2 °C), and another quarter of the time, the high temperature is greater than and 86.9 °F (30.5 °C). About 95% of the time, the high temperature has been between 71.7 °F (22.1 °C) and 94.2 °F (34.6 °C).

Low Temperatures

On July 21 in NORTHERLY ISLAND the average low temperature is 69.8 °F (21.0 °C). The lowest recored low temperature was 65.1 °F (18.4 °C) in 2021 and the lowest recored low temperature was 85.5 °F (29.7 °C) in 2022. The low temperature is usually^* between 66.8 °F (19.4 °C) and 72.7 °F (22.6 °C). About a quarter of the time, the low temperature is less than 66.8 °F (19.4 °C), and another quarter of the time, the low temperature is greater than and 72.7 °F (22.6 °C). About 95% of the time, the low temperature has been between 61.3 °F (16.3 °C) and 78.3 °F (25.7 °C).

Frost

On July 21 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 2025

Home | About this site | Blog | Privacy policy | Contact us | Update cookies preferences

© Banana Juice LLC, Chicago, Illinois, USA