Galesburg (IL) Weather & Climate: Best Time to Visit

Visitors to Galesburg can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -1°C (30°F) in the coolest month, January.

Nights vary from 18°C (64°F) in July to around -10°C (14°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Galesburg is known for its substantial rain/snowfall, with annual precipitation reaching 1069 mm (42 in). The climate in Galesburg shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 150 mm (5.9 in) of precipitation over 13 rainy days.

In contrast, the driest month January offers drier and sunnier days, with around 40 mm (1.6 in) of snowfall over 8 snowy days. For more details, please visit our Galesburg Precipitation page.

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

The average number of days each month with precipitation

For those who appreciate different seasons, Galesburg serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.1 hours of sunshine daily, and embrace the darker days in December, offering only 3.8 hours of daily sunlight.

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 Galesburg.

The city experiences its highest humidity in December, reaching 73%. In April, 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