Johnston, Iowa gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Johnston averages 34 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 199 sunny days per year in Johnston. The US average is 205 sunny days.
Johnston gets some kind of precipitation, on average, 109 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.
Summer High: the July high is around 86 degrees
Winter Low: the January low is 13
Rain: averages 36 inches of rain a year
Snow: averages 34 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Johnston is 6.9 (10=best), which means it is more comfortable than most places in Iowa.
6.9 / 10
September, June and May are the most pleasant months in Johnston, while January and December are the least comfortable months.