Rock City, IL Climate

Rock City, IL has a humid continental climate, which is characterized by cold winters and hot summers. In the winter months, temperatures can drop below freezing, with an average snowfall of around 25 inches per year. During the summer months, temperatures usually stay in the high 80s and low 90s with moderate to high humidity levels. The city also experiences four distinct seasons throughout the year, with spring bringing blooming flowers and warm weather, summer being hot and humid, fall brings crisp temperatures and colorful foliage, and winter being cold and snowy.

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

Rock City averages 36 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 191 sunny days per year in Rock City. The US average is 205 sunny days.

Rock City gets some kind of precipitation, on average, 114 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 84 degrees
Winter Low: the January low is 10
Rain: averages 37 inches of rain a year
Snow: averages 36 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Rock City is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

9 Summer - 4.3 Winter

June, August and September are the most pleasant months in Rock City, while January and December are the least comfortable months.

Climate	Rock City, Illinois	United States
	Unlock	38.1 in.
	36.1 in.	Unlock
	Unlock	106.2 days
	191 days	Unlock
	83.6°	85.8°
	Unlock	21.7°
	6.8	Unlock
	Unlock	4.3
	909 ft.	Unlock

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 City with an average high temperature of 83.6°, which ranks it as cooler than most places in Illinois. In Rock City, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rock City are June, August and September.

In Rock City, there are 11.1 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 City with an average of 10.3°. This is one of the coldest places in Illinois.

In Rock City, there are 147.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Rock City, there are 16.6 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

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

June is the wettest month in Rock City with 5.0 inches of rain, and the driest month is January with 1.4 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 36.9 inches in Rock City means that it is drier than most places in Illinois.

May is the rainiest month in Rock City with 11.9 days of rain, and February is the driest month with only 7.4 rainy days. There are 114.0 rainy days annually in Rock City, 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 22% chance of a rainy day.

An annual snowfall of 36.1 inches in Rock City means that it is one of the snowiest places in Illinois. December is the snowiest month in Rock City with 11.0 inches of snow, and 6 months of the year have significant snowfall.