Knoxville (IA) Weather & Climate: Best Time to Visit

The climate in Knoxville is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 30°C (86°F) in July to a very cold -1°C (30°F) in the coolest month, January.

Nights vary from 19°C (66°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

Knoxville has a notably wet climate with abundant precipitation, recording 1012 mm (40 in) of rain/snowfall per year. The climate in Knoxville shows significant variation throughout the year. Expect heavy rainfall in June, the wettest month, with an average of 162 mm (6.4 in) of precipitation over 14 rainy days.

In contrast, the driest month January offers drier and sunnier days, with around 20 mm (0.8 in) of snowfall over 7 snowy days. For more details, please visit our Knoxville 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, Knoxville serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.2 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 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 Knoxville.

The city experiences its highest humidity in January, reaching 72%. In May, the humidity drops to its lowest level at 60%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year