Rock Island County, IL Climate

Rock Island, IL County has a humid continental climate with four distinct seasons. Summers are hot and humid, with temperatures generally reaching into the 80s and occasional heat waves that can reach into the 90s. Winters are cold and icy, with temperatures usually in the 20s but potentially dropping below 0F. Spring is wet and mild while fall is dry and cool. Precipitation is spread out throughout the year; snowfall tends to be higher in January and February than other months.

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

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

On average, there are 201 sunny days per year in Rock Island County. The US average is 205 sunny days.

Rock Island County gets some kind of precipitation, on average, 112 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 County is 7.0 (10=best), which means it is about average compared to other places in Illinois.

8.7 Summer - 4.7 Winter

September, June and May are the most pleasant months in Rock Island County, while January and December are the least comfortable months.

Climate	Rock Island, Illinois	United States
	36.9 in.	38.1 in.
	28.4 in.	27.8 in.
	111.9 days	106.2 days
	201 days	205 days
	85.1°	85.8°
	14.6°	21.7°
	7	7
	3.7	4.3
	658 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Rock Island County with an average high temperature of 85.1°, which ranks it as about average compared to other places in Illinois. In Rock Island County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rock Island County are September, June and August.

In Rock Island County, there are 16.4 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Rock Island County with an average of 14.6°. This is colder than most places in Illinois.

In Rock Island County, there are 124.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Rock Island County, there are 9.9 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

The humidity is usually comfortable in Rock Island County but some summer months can be unpleasant. July is the most humid month, though humidity is low for most of the year. The most humid months in Rock Island County are July, August and June.

June is the wettest month in Rock Island County with 4.6 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 36.9 inches in Rock Island County means that it is drier than most places in Illinois.

May is the rainiest month in Rock Island County with 11.5 days of rain, and February is the driest month with only 7.7 rainy days. There are 111.9 rainy days annually in Rock Island County, 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 28.4 inches in Rock Island County means that it is snowier than most places in Illinois. January is the snowiest month in Rock Island County with 8.5 inches of snow, and 6 months of the year have significant snowfall.

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