Sangamon County, IL Climate

Sangamon County, IL has a humid continental climate that features hot, humid summers and cold winters. The average high temperature in July is around 87°F (31°C), while the average low temperature in January is 17°F (-8°C). Precipitation is plentiful throughout the year, with an annual average of about 34 inches (86 cm). Snowfall can range from a trace to 18 inches (46 cm) during the winter months. The area experiences thunderstorms on a regular basis during spring and summer months.

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

Sangamon County averages 18 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 198 sunny days per year in Sangamon County. The US average is 205 sunny days.

Sangamon County gets some kind of precipitation, on average, 102 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 19
Rain: averages 38 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Sangamon County is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

8.4 Summer - 5.3 Winter

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

Climate	Sangamon, Illinois	United States
	38.3 in.	38.1 in.
	17.8 in.	27.8 in.
	102.1 days	106.2 days
	198 days	205 days
	85.6°	85.8°
	18.5°	21.7°
	7.2	7
	3.9	4.3
	597 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 Sangamon County with an average high temperature of 85.6°, which ranks it as about average compared to other places in Illinois. In Sangamon County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sangamon County are September, May and June.

In Sangamon County, there are 19.6 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 Sangamon County with an average of 18.5°. This is warmer than most places in Illinois.

In Sangamon County, there are 114.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Sangamon County, 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 Sangamon 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 Sangamon County.

June is the wettest month in Sangamon County with 4.4 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 30% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 38.3 inches in Sangamon County means that it is drier than most places in Illinois.

May is the rainiest month in Sangamon County with 10.8 days of rain, and September is the driest month with only 6.9 rainy days. There are 102.1 rainy days annually in Sangamon 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 23% chance of a rainy day.

An annual snowfall of 17.8 inches in Sangamon County means that it is less snowy than most places in Illinois. January is the snowiest month in Sangamon County with 5.4 inches of snow, and 5 months of the year have significant snowfall.

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