Johnson County, IL Climate

Johnson, IL County has a humid continental climate, with hot summers and cold winters. The average temperature in July is 79°F (26°C) and the average temperature in January is 25°F (-4°C). Precipitation is spread throughout the year although there are slightly more days of precipitation during the summer months. Snowfall can be heavy during the winter months with an average of 25-30 inches per year. The area does experience occasional severe weather events such as thunderstorms with damaging winds or tornadoes.

Johnson County, Illinois gets 49 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Johnson County averages 9 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 203 sunny days per year in Johnson County. The US average is 205 sunny days.

Johnson County gets some kind of precipitation, on average, 105 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 89 degrees
Winter Low: the January low is 25
Rain: averages 49 inches of rain a year
Snow: averages 9 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Johnson County is 7.3 (10=best), which means it is one of the most pleasant places in Illinois.

7.4 Summer - 5.8 Winter

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

Climate	Johnson, Illinois	United States
	Unlock	38.1 in.
	9.0 in.	Unlock
	Unlock	106.2 days
	203 days	Unlock
	88.5°	85.8°
	Unlock	21.7°
	7.3	Unlock
	Unlock	4.3
	501 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 Johnson County with an average high temperature of 88.5°, which ranks it as one of the hottest places in Illinois. In Johnson County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Johnson County are May, September and June.

In Johnson County, there are 35.4 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

January has the coldest nighttime temperatures for Johnson County with an average of 24.6°. This is one of the warmest places in Illinois.

In Johnson County, there are 87.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Johnson County, there are 1.4 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

The humidity can be uncomfortably heavy or close in Johnson 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 Johnson County.

May is the wettest month in Johnson County with 5.5 inches of rain, and the driest month is August with 3.1 inches. The wettest season is Summer with 30% of yearly precipitation and 23% occurs in Autumn, which is the driest season. The annual rainfall of 49.0 inches in Johnson County means that it is one of the wettest places in Illinois.

May is the rainiest month in Johnson County with 10.7 days of rain, and August is the driest month with only 6.4 rainy days. There are 104.8 rainy days annually in Johnson 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 Autumn with only a 22% chance of a rainy day.

An annual snowfall of 9.0 inches in Johnson County means that it is one of the least snowy places in Illinois. February is the snowiest month in Johnson County with 3.3 inches of snow, and 4 months of the year have significant snowfall.

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