Shelby County, IL Climate

Shelby County, IL is situated in the heart of Illinois and enjoys a temperate climate. Summers in Shelby County are hot and humid with temperatures reaching into the mid-80s on average. Winters can be cold and snowy, as temperatures generally dip down into the 30s and below. Precipitation is fairly evenly distributed throughout the year, with an annual rainfall of around 38 inches. Snowfall is also relatively common during the winter months, adding to the overall chill of the air. On average, temperatures in Shelby County range from around 25 degrees Fahrenheit in January to 81 degrees Fahrenheit in July. All in all, Shelby County enjoys a comfortable climate that allows for a variety of activities year round.

Shelby County, Illinois gets 41 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Shelby County averages 16 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 Shelby County. The US average is 205 sunny days.

Shelby County gets some kind of precipitation, on average, 107 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 87 degrees
Winter Low: the January low is 19
Rain: averages 41 inches of rain a year
Snow: averages 16 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Shelby County is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.2 Summer - 5.3 Winter

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

Climate	Shelby, Illinois	United States
	40.8 in.	38.1 in.
	15.6 in.	27.8 in.
	106.9 days	106.2 days
	198 days	205 days
	86.5°	85.8°
	18.7°	21.7°
	7.1	7
	3.9	4.3
	634 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 Shelby County with an average high temperature of 86.5°, which ranks it as warmer than most places in Illinois. In Shelby County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Shelby County are September, May and June.

In Shelby County, there are 22.4 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Shelby County with an average of 18.7°. This is warmer than most places in Illinois.

In Shelby County, there are 113.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Shelby County, there are 4.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity can be uncomfortably heavy or close in Shelby County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Shelby County.

May is the wettest month in Shelby County with 4.6 inches of rain, and the driest month is February with 2.2 inches. The wettest season is Summer with 28% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 40.8 inches in Shelby County means that it is wetter than most places in Illinois.

May is the rainiest month in Shelby County with 11.6 days of rain, and September is the driest month with only 7.1 rainy days. There are 106.9 rainy days annually in Shelby County, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 15.6 inches in Shelby County means that it is less snowy than most places in Illinois. January is the snowiest month in Shelby County with 5.0 inches of snow, and 5 months of the year have significant snowfall.

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