Vernon Hills (IL) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to very cold in Vernon Hills. Average daytime temperatures reach a comfortable 28°C (82°F) in July. In January, the coolest month of the year, temperatures drop to a very cold -1°C (30°F).

At night, temperatures range from around 18°C (64°F) in July to -10°C (14°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Vernon Hills has a relatively rain/snowy climate with high precipitation levels, averaging 1024 mm (40 in) of rain/snowfall annually. Vernon Hills can be quite wet during July, receiving approximately 121 mm (4.8 in) of precipitation over 11 rainy days.

In contrast, during the driest month (January), you will experience much drier conditions, with 42 mm (1.7 in) of precipitation spread across 10 snowy days. For more details, please visit our Vernon Hills Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Vernon Hills can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 3.6 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Vernon Hills.

The city experiences its highest humidity in December, reaching 76%. In May, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year