Grinnell, IA has a temperate climate, with hot summers and cold winters. The region experiences four distinct seasons: spring, summer, fall and winter. Summers are generally humid and warm with temperatures reaching into the mid 80s Fahrenheit during the day. Winters are cold with temperatures typically in the 20s and 30s Fahrenheit during the day. Spring and autumn bring mild weather with temperatures averaging in the 50s and 60s Fahrenheit during April and October. Rainfall is spread out evenly throughout the year, although there is slightly more rain in May than other months.
Grinnell, Iowa gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Grinnell averages 27 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 196 sunny days per year in Grinnell. The US average is 205 sunny days.
Grinnell gets some kind of precipitation, on average, 104 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 84 degrees
Winter Low: the January low is 10
Rain: averages 37 inches of rain a year
Snow: averages 27 inches of snow a year