Rock Valley, Iowa gets 28 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Rock Valley averages 33 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 207 sunny days per year in Rock Valley. The US average is 205 sunny days.
Rock Valley gets some kind of precipitation, on average, 86 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 85 degrees
Winter Low: the January low is 8
Rain: averages 28 inches of rain a year
Snow: averages 33 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Rock Valley is 6.9 (10=best), which means it is more comfortable than most places in Iowa.
6.9 / 10
June, August and September are the most pleasant months in Rock Valley, while January and December are the least comfortable months.