McDonough County, IL Climate

McDonough County is located in west central Illinois and has a humid continental climate, characterized by warm summers with occasional extreme heat and cold winters. Summers are usually hot and muggy due to the combination of high humidity with temperatures typically in the 80s Fahrenheit (27-32°C). Winters are cold with moderate snowfall, temperatures typically in the 30s Fahrenheit (-1 to 4°C). The county receives an average of 36 inches of rain annually. Thunderstorms are common during the summer months.

McDonough County, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

McDonough County averages 20 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 196 sunny days per year in McDonough County. The US average is 205 sunny days.

McDonough County gets some kind of precipitation, on average, 97 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 15
Rain: averages 39 inches of rain a year
Snow: averages 20 inches of snow a year

Bestplaces Comfort Index

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

8.4 Summer - 5.1 Winter

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

Climate	McDonough, Illinois	United States
	Unlock	38.1 in.
	20.1 in.	Unlock
	Unlock	106.2 days
	196 days	Unlock
	86.1°	85.8°
	Unlock	21.7°
	7.1	Unlock
	Unlock	4.3
	666 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 McDonough County with an average high temperature of 86.1°, which ranks it as warmer than most places in Illinois. In McDonough County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for McDonough County are September, June and May.

In McDonough County, there are 19.4 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

January has the coldest nighttime temperatures for McDonough County with an average of 15.3°. This is colder than most places in Illinois.

In McDonough County, there are 127.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In McDonough County, there are 7.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

June is the wettest month in McDonough County with 4.5 inches of rain, and the driest month is January with 1.6 inches. The wettest season is Autumn with 32% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 38.8 inches in McDonough County means that it is about average compared to other places in Illinois.

May is the rainiest month in McDonough County with 10.8 days of rain, and February is the driest month with only 5.9 rainy days. There are 96.5 rainy days annually in McDonough County, which is one of the least rainy places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 20.1 inches in McDonough County means that it is about average compared to other places in Illinois. January is the snowiest month in McDonough County with 6.8 inches of snow, and 5 months of the year have significant snowfall.

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