Decatur Metro Area, IL Climate

The Decatur, IL Metro Area experiences a humid continental climate, with hot and humid summers and cold winters. During the summer months, temperatures are typically in the mid-80s Fahrenheit and can reach as high as the upper 90s. The winters bring cold temperatures in the low-30s Fahrenheit, with occasional snowfall. Precipitation is fairly evenly distributed throughout the year, ensuring an abundance of rain and snow. The climate provides plenty of sunshine for outdoor activities year-round.

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

Decatur Metro Area averages 14 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 200 sunny days per year in Decatur Metro Area. The US average is 205 sunny days.

Decatur Metro Area 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 14 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the Decatur metro area 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 the Decatur metro area, while January and December are the least comfortable months.

Climate	Decatur, Illinois	United States
	39.5 in.	38.1 in.
	14.1 in.	27.8 in.
	103.5 days	106.2 days
	200 days	205 days
	86.8°	85.8°
	18.7°	21.7°
	7.2	7
	3.9	4.3
	667 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 the Decatur metro area with an average high temperature of 86.8°, which ranks it as warmer than most places in Illinois. In the Decatur metro area, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the Decatur metro area are September, May and June.

In the Decatur metro area, there are 24.1 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

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

In the Decatur metro area, there are 113.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In the Decatur metro area, there are 4.9 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 the Decatur metro area 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 the Decatur metro area.

May is the wettest month in the Decatur metro area with 4.5 inches of rain, and the driest month is January with 2.0 inches. The wettest season is Autumn with 31% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 39.5 inches in the Decatur metro area means that it is about average compared to other places in Illinois.

May is the rainiest month in the Decatur metro area with 11.2 days of rain, and February is the driest month with only 6.9 rainy days. There are 103.5 rainy days annually in the Decatur metro area, 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 14.1 inches in the Decatur metro area means that it is less snowy than most places in Illinois. January is the snowiest month in the Decatur metro area with 4.4 inches of snow, and 4 months of the year have significant snowfall.

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