Illinois 

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Climate in Illinois

Illinois, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Illinois averages 22 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 Illinois. The US average is 205 sunny days.

Illinois gets some kind of precipitation, on average, 108 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 86 degrees
Winter Low: the January low is 17
Rain: averages 40 inches of rain a year
Snow: averages 22 inches of snow a year


BESTPLACES COMFORT INDEX

Illinois's annual BestPlaces Comfort Index of 7.1 (10=best) indicates it is about average compared to other states in the United States.

7.1 / 10
September, June and May are the most pleasant months in the state of Illinois, while January and December are the least comfortable months.

Climate Averages
  Illinois, IllinoisUnited States
  39.8 in.38.1 in.
  21.8 in.27.8 in.
  108.2 days106.2 days
  198 days205 days
  85.6°85.8°
  17.4°21.7°
  7.17
  3.94.3
  604 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 Illinois with an average high temperature of 85.6°, which ranks it as about average compared to other states. In Illinois, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Illinois are September, June and May.


January has the coldest nighttime temperatures for Illinois with an average of 17.4°. This is colder than most of the U.S. states.


Illinois has 20.5 days annually when the high temperature is over 90°, which is about average compared to other states in the U.S.


Illinois has 118.3 days annually when the nighttime low temperature falls below freezing, which is about average compared to other states in the U.S.


Illinois averages 6.6 days annually when the nighttime low temperature falls below freezing, which is colder than most states in the U.S.


May is the wettest month in Illinois with 4.5 inches of rain, and the driest month is January with 2.0 inches. The wettest season is Autumn with 30% of yearly precipitation and 17% occurs in Spring, which is the driest season. Illinois's average annual rainfall of 39.8 inches indicates that it is about average compared to other states in the United States.


May is the rainiest month in Illinois with 11.2 days of rain, and February is the driest month with only 7.4 rainy days. Illinois's annual average of 108.2 days with measurable rain is about average compared to other states in the United States. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 23% chance of a rainy day.


With an average annual snowfall of 21.8 inches, Illinois is less snowy than most states in the United States. January is the snowiest month in Illinois with 6.8 inches of snow, and 5 months of the year have significant snowfall.





CLIMATE MAP
  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Illinois    73 Reviews
    Land of the tax now? - 7/14/2019
    Born and raised in southern IL. 5 years ago this was a great state to live in, but we just recently elected a new government, I personally didn’t pay much attention... Read More

    Start Your Review of Illinois


    Peotone Ill - 8/21/2015
    I have been in the town of peotone for 13 years and now selling! I have never seen a more poor excuse for a town. There is no were to go and nothing too do. The town... Read More

    36 years here - 8/1/2015
    I'm tired of everyone thinking chicago is all illinois is.... Even the politicians think only of Chicago... We have not had a state budget set yet amd people in small... Read More


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    MAPS OF ILLINOIS
    Illinois
    ZIP CODES IN ILLINOIS
    60629, 60618, 60632, 60639, 60623, 60647, 60804, 60617, 60625, 60608, ... 1384 more

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