Duncan, IA is located in the Midwestern United States and is known for its hot, humid summers and cold winters. Average high temperatures range from the mid-30s during winter to the mid-80s during summer. Precipitation is spread relatively evenly throughout the year, with occasional snowfall in winter and occasional severe storm systems bringing heavy rains and sometimes flooding in summer. Duncan enjoys four distinct seasons that provide a variety of conditions to enjoy outdoor activities.
Duncan, Iowa gets 33 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Duncan averages 36 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 190 sunny days per year in Duncan. The US average is 205 sunny days.
Duncan gets some kind of precipitation, on average, 94 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 82 degrees
Winter Low: the January low is 6
Rain: averages 33 inches of rain a year
Snow: averages 36 inches of snow a year