Sumner, IA has a pleasant continental climate with four distinct seasons. Summers can be hot and humid, with average temperatures reaching into the low 80s F (27 C). Winters are cold and snowy, with temperatures averaging in the 20s F (-6 C) for extended periods of time. Spring and autumn are mild and generally sunny, perfect for enjoying outdoor activities. The area receives an average of 36 inches (91 cm) of precipitation annually with most of it falling during the spring and summer months.
Sumner, Iowa gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Sumner averages 36 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 188 sunny days per year in Sumner. The US average is 205 sunny days.
Sumner gets some kind of precipitation, on average, 103 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 7
Rain: averages 36 inches of rain a year
Snow: averages 36 inches of snow a year