Climate in Rock Island, Illinois

Rock Island, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Rock Island averages 28 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 198 sunny days per year in Rock Island. The US average is 205 sunny days.

Rock Island gets some kind of precipitation, on average, 115 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 15
Rain: averages 37 inches of rain a year
Snow: averages 28 inches of snow a year

BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for Rock Island is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

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

January has the coldest nighttime temperatures for Rock Island with an average of 14.5°. This is colder than most places in Illinois.

In Rock Island, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Rock Island, there are 124.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Rock Island, there are 10.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

June is the wettest month in Rock Island with 4.6 inches of rain, and the driest month is January with 1.3 inches. The wettest season is Autumn with 36% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 37.0 inches in Rock Island means that it is drier than most places in Illinois.

May is the rainiest month in Rock Island with 11.7 days of rain, and September is the driest month with only 8.0 rainy days. There are 115.3 rainy days annually in Rock Island, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 28.2 inches in Rock Island means that it is snowier than most places in Illinois. January is the snowiest month in Rock Island with 8.5 inches of snow, and 6 months of the year have significant snowfall.

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