Winnebago County, IL Climate

Winnebago, IL County experiences a humid continental climate with mild winters and hot summers. The average winter low temperatures range from the 20s to the 30s while summer highs can reach into the 80s and even 90s. Precipitation is fairly evenly spread throughout the year, while snowfall averages around 30 inches annually. Winnebago enjoys long summer days with some of the shortest nights in the area, which helps to keep temperatures cool during those warm months. Overall, Winnebago has a pleasant climate that provides plenty of sunshine for outdoor activities.

Winnebago County, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Winnebago County averages 35 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 191 sunny days per year in Winnebago County. The US average is 205 sunny days.

Winnebago County gets some kind of precipitation, on average, 116 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 84 degrees
Winter Low: the January low is 12
Rain: averages 37 inches of rain a year
Snow: averages 35 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Winnebago County is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

9 Summer - 4.3 Winter

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

Climate	Winnebago, Illinois	United States
	36.9 in.	38.1 in.
	34.5 in.	27.8 in.
	115.6 days	106.2 days
	191 days	205 days
	83.5°	85.8°
	12.3°	21.7°
	6.8	7
	3.5	4.3
	802 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 Winnebago County with an average high temperature of 83.5°, which ranks it as cooler than most places in Illinois. In Winnebago County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Winnebago County are June, September and August.

In Winnebago County, there are 11.6 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Winnebago County with an average of 12.3°. This is one of the coldest places in Illinois.

In Winnebago County, there are 139.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Winnebago County, there are 13.4 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

The humidity is usually comfortable in Winnebago County but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.

June is the wettest month in Winnebago County with 4.9 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 36% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 36.9 inches in Winnebago County means that it is drier than most places in Illinois.

May is the rainiest month in Winnebago County with 11.9 days of rain, and February is the driest month with only 7.9 rainy days. There are 115.6 rainy days annually in Winnebago County, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 34.5 inches in Winnebago County means that it is one of the snowiest places in Illinois. December is the snowiest month in Winnebago County with 11.0 inches of snow, and 6 months of the year have significant snowfall.

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