Knoxville (IA) Sunshine Hours by Month

When exploring climate, sunlight hours tell an important story. This page shows the total number of hours of direct sunlight per month and the average hours per day in Knoxville, Iowa, United States of America. These values are calculated using 30 years of data (1990–2020) to ensure accuracy.

Monthly hours of sunshine

Sunshine in Knoxville varies greatly throughout the year. The sunniest month, July, reaches an impressive 335 hours, while December, the darkest month, offers only 129 hours. The total annual amount of sun is 2700 hours.

Daily hours of sunshine

Seasonal changes in sunshine hours are quite obvious in Knoxville. While July receives considerable daily sunshine with up to 11.2 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.3 hours of sunlight per day.

Average percent of sunshine

On average the sun shines 72% of the time during the day in July, the highest percentage of any month. December has the lowest percentage at 45%.

Knoxville enjoys an average of 2700 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

In Barcelona, Spain, there are 2530 hours of sunshine annually and is a city that can be visited year-round.

In contrast, Reykjavík, Iceland, receives only about 1330 hours of sunshine per year, known for its frequently overcast and rainy skies.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 2520 hours of sunshine annually.

In Tokyo, Japan, the average annual sunshine is 1930 hours, with sunny periods between rainy seasons.

June, Knoxville’s wettest month, receives 129 mm (5.1 in) of rainfall and has a maximum daytime temperature of 28°C (82°F). During the driest month January you can expect a temperature of -1°C (30°F).

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Knoxville Precipitation page.