How many days of sunshine in South Dakota?

On average, South Dakota receives 3,500 hours of sunshine per year, or about 9.6 hours of sunshine per day. This makes South Dakota one of the sunniest states in the United States. The sunniest month is July, with an average of 11.8 hours of sunshine per day, while the cloudiest month is December, with an average of 4.8 hours of sunshine per day.