Grundy County, IL Climate

Grundy County, IL has a humid continental climate with hot summers, cold winters, and moderate precipitation throughout the year. The warmest month is July when temperatures reach up to 82°F during the day. January is usually the coldest month with temperatures dropping down to 20°F overnight. Annual precipitation averages around 35 inches per year which tends to be higher in summer months and lower in winter months. Snowfall can range from 20-30 inches annually with much of it falling from December through February.

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

Grundy County averages 23 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 189 sunny days per year in Grundy County. The US average is 205 sunny days.

Grundy County gets some kind of precipitation, on average, 111 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 15
Rain: averages 37 inches of rain a year
Snow: averages 23 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Grundy County is 7.0 (10=best), which means it is about average compared to other places in Illinois.

8.8 Summer - 4.8 Winter

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

Climate	Grundy, Illinois	United States
	37.3 in.	38.1 in.
	22.8 in.	27.8 in.
	110.7 days	106.2 days
	189 days	205 days
	84.4°	85.8°
	15.0°	21.7°
	7	7
	3.5	4.3
	583 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 Grundy County with an average high temperature of 84.4°, which ranks it as cooler than most places in Illinois. In Grundy County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grundy County are September, June and August.

In Grundy County, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Grundy County with an average of 15.0°. This is colder than most places in Illinois.

In Grundy County, there are 129.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Grundy County, there are 8.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

The humidity is usually comfortable in Grundy 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.

July is the wettest month in Grundy County with 4.4 inches of rain, and the driest month is February with 1.6 inches. The wettest season is Autumn with 33% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 37.3 inches in Grundy County means that it is drier than most places in Illinois.

May is the rainiest month in Grundy County with 11.2 days of rain, and September is the driest month with only 7.5 rainy days. There are 110.7 rainy days annually in Grundy 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 22.8 inches in Grundy County means that it is snowier than most places in Illinois. January is the snowiest month in Grundy County with 7.2 inches of snow, and 6 months of the year have significant snowfall.

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