Adams County, IL Climate

Adams County, IL has a humid continental climate with warm summers and cold winters. Precipitation is generally spread throughout the year, although summer does tend to be slightly wetter than other times of the year. The average annual temperature is around 50°F (10°C), with January lows reaching as far as -20°F (-29°C). Snowfall can happen at any time during the winter months and while not overly common, it is still something to prepare for. Summers are usually hot and humid, but temperatures rarely exceed 90°F (32°C).

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

Adams County averages 18 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 Adams County. The US average is 205 sunny days.

Adams County gets some kind of precipitation, on average, 100 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 18
Rain: averages 39 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Adams County 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 Adams County, while January and December are the least comfortable months.

Climate	Adams, Illinois	United States
	38.7 in.	38.1 in.
	17.7 in.	27.8 in.
	99.9 days	106.2 days
	199 days	205 days
	86.4°	85.8°
	17.5°	21.7°
	7.2	7
	3.8	4.3
	649 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 Adams County with an average high temperature of 86.4°, which ranks it as warmer than most places in Illinois. In Adams County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Adams County are September, June and May.

In Adams County, there are 22.8 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Adams County with an average of 17.5°. This is about average compared to other places in Illinois.

In Adams County, there are 115.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Adams County, there are 6.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

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

May is the wettest month in Adams County with 4.8 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 38.7 inches in Adams County means that it is about average compared to other places in Illinois.

May is the rainiest month in Adams County with 11.1 days of rain, and January is the driest month with only 6.4 rainy days. There are 99.9 rainy days annually in Adams County, 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 20% chance of a rainy day.

An annual snowfall of 17.7 inches in Adams County means that it is less snowy than most places in Illinois. January is the snowiest month in Adams County with 5.6 inches of snow, and 5 months of the year have significant snowfall.

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