Winthrop Harbor Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to very cold in Winthrop Harbor. On average, daytime temperatures range from a comfortable 26°C (79°F) in July to a very cold -1°C (30°F) in January.

Nighttime temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Winthrop Harbor has a moderate amount of precipitation, averaging 961 mm (38 in) of rain/snowfall annually. The seasons in Winthrop Harbor bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 107 mm (4.2 in) of precipitation. This rainfall is distributed across 13 rainy days.

In contrast, the driest month, January, experiences much less snowfall, totaling 40 mm (1.6 in) over 10 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Winthrop Harbor Precipitation page.

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

The average number of days each month with precipitation

In Winthrop Harbor, summer days are longer and more sunny, with daily sunshine hours peaking at 10.6 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average 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 Winthrop Harbor.

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