- Country: US
- State: IL
- Latitude: 41.856
- Longitude: -87.609
High Temperatures
On May 17 in NORTHERLY ISLAND the average high temperature is 71.6 °F (22.0 °C). The lowest recored high temperature was 58.5 °F (14.7 °C) in 2014 and the highest recored high temperature was 86.0 °F (30.0 °C) in 2017. The high temperature is usually* between 65.0 °F (18.3 °C) and 78.2 °F (25.7 °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 78.2 °F (25.7 °C). About 95% of the time, the high temperature has been between 52.5 °F (11.4 °C) and 90.7 °F (32.6 °C).
Low Temperatures
On May 17 in NORTHERLY ISLAND the average low temperature is 51.6 °F (10.9 °C). The lowest recored low temperature was 41.2 °F (5.1 °C) in 2014 and the lowest recored low temperature was 59.0 °F (15.0 °C) in 2015. The low temperature is usually* between 47.3 °F (8.5 °C) and 56.0 °F (13.3 °C). About a quarter of the time, the low temperature is less than 47.3 °F (8.5 °C), and another quarter of the time, the low temperature is greater than and 56.0 °F (13.3 °C). About 95% of the time, the low temperature has been between 39.0 °F (3.9 °C) and 64.3 °F (17.9 °C).
Frost
On May 17 in NORTHERLY ISLAND expect the temperatures to drop below freezing for a risk of frost about 0.1% 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