Climate in Rock Valley, Iowa

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.

Weather Highlights

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.

July is the hottest month for Rock Valley with an average high temperature of 84.7°, which ranks it as warmer than most places in Iowa. In Rock Valley, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rock Valley are September, June and August.

January has the coldest nighttime temperatures for Rock Valley with an average of 7.7°. This is colder than most places in Iowa.

In Rock Valley, there are 17.1 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.

In Rock Valley, there are 157.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Iowa.

In Rock Valley, there are 23.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.

June is the wettest month in Rock Valley with 4.3 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Autumn with 41% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 28.1 inches in Rock Valley means that it is one of the driest places in Iowa.

May is the rainiest month in Rock Valley with 11.1 days of rain, and February is the driest month with only 4.0 rainy days. There are 85.9 rainy days annually in Rock Valley, which is one of the least rainy places in Iowa. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 15% chance of a rainy day.

An annual snowfall of 32.8 inches in Rock Valley means that it is snowier than most places in Iowa. December is the snowiest month in Rock Valley with 8.1 inches of snow, and 7 months of the year have significant snowfall.

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