Decatur, IL Climate


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United States / Illinois / Decatur Metro Area / Macon County / Decatur / Zip Codes
Decatur, IL has a humid continental climate, characterized by hot summers and cold winters. The average high in July is around 87°F (30°C) and the average low in January is around 17°F (-8°C). Precipitation is fairly evenly distributed throughout the year with an average of 44 inches (112 cm). The city gets a good amount of sunshine year-round with an average of 219 days of sun each year. Snowfall typically ranges from 9-14 inches (23-36 cm) annually, usually between November and March.

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

Decatur averages 13 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 199 sunny days per year in Decatur. The US average is 205 sunny days.

Decatur gets some kind of precipitation, on average, 104 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 40 inches of rain a year
Snow: averages 13 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Decatur is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

8.3 Summer - 5.3 Winter
September, June and May are the most pleasant months in Decatur, while January and December are the least comfortable months.

  ClimateDecatur, IllinoisUnited States
    Unlock38.1 in.
  13.0 in.  Unlock
    Unlock106.2 days
  199 days  Unlock
  86.9°85.8°
    Unlock21.7°
  7.2  Unlock
    Unlock4.3
  676 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 Decatur with an average high temperature of 86.9°, which ranks it as warmer than most places in Illinois. In Decatur, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Decatur are September, May and June.
In Decatur, there are 24.8 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.
January has the coldest nighttime temperatures for Decatur with an average of 18.8°. This is warmer than most places in Illinois.
In Decatur, there are 112.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.
In Decatur, there are 4.8 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 Decatur 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 Decatur.
June is the wettest month in Decatur with 4.5 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 31% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 39.5 inches in Decatur means that it is about average compared to other places in Illinois.
May is the rainiest month in Decatur with 11.5 days of rain, and September is the driest month with only 6.9 rainy days. There are 104.3 rainy days annually in Decatur, which is less rainy than most 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 13.0 inches in Decatur means that it is less snowy than most places in Illinois. January is the snowiest month in Decatur with 4.2 inches of snow, and 4 months of the year have significant snowfall.
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Ray · Decatur, IL
Hot in the summer; cold, windy, and cloudy in the
Over 12 years ago

I was sent here by the company I worked for in the '90's and was not initially impressed with midwest living. However, over the years I got used to living in the "Pride  More

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Bp · Tucson, AZ
Has Changed not for the Better!!!
Over 13 years ago

I grew up in Decatur and I still have family there, but it depresses me to see what it has become. It has a high unemployment rate, many business have closed or are run  More

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David  · Decatur, IL
Drive-thru liquor windows
Over 14 years ago

If you enjoy drinking & driving, Decatur's fifteen drive-thru liquor windows, three times the # of drive-thru's than the ten largest cities in Illinois, COMBINED, will  More

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