Sullivan County, IN Climate

Sullivan, IN County has a humid continental climate. Summers are hot and humid, with temperatures often reaching the mid-80s during the day and staying in the high 60s or low 70s at night. Winters are cold and snowy, with temperatures sometimes dropping to single digits and below zero. Snowfall usually occurs between November and March, with average snowfall amounts of around 20 inches per season. Precipitation is spread throughout the year, though summer is generally wetter than winter.

Sullivan County, Indiana gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Sullivan County averages 12 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 Sullivan County. The US average is 205 sunny days.

Sullivan County gets some kind of precipitation, on average, 114 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 21
Rain: averages 44 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

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

8.1 Summer - 5.3 Winter

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

Climate	Sullivan, Indiana	United States
	44.3 in.	38.1 in.
	12.1 in.	27.8 in.
	114.3 days	106.2 days
	198 days	205 days
	86.3°	85.8°
	20.7°	21.7°
	7.1	7
	4.2	4.3
	510 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 Sullivan County with an average high temperature of 86.3°, which ranks it as warmer than most places in Indiana. In Sullivan County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sullivan County are September, May and June.

In Sullivan County, there are 21.7 days annually when the high temperature is over 90°, which is hotter than most places in Indiana.

January has the coldest nighttime temperatures for Sullivan County with an average of 20.7°. This is warmer than most places in Indiana.

In Sullivan County, there are 107.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Indiana.

In Sullivan County, there are 3.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Indiana.

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

May is the wettest month in Sullivan County with 5.2 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Summer with 29% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 44.3 inches in Sullivan County means that it is wetter than most places in Indiana.

May is the rainiest month in Sullivan County with 12.2 days of rain, and September is the driest month with only 7.3 rainy days. There are 114.3 rainy days annually in Sullivan County, which is less rainy than most places in Indiana. The rainiest season is Summer when it rains 30% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 12.1 inches in Sullivan County means that it is less snowy than most places in Indiana. January is the snowiest month in Sullivan County with 4.1 inches of snow, and 4 months of the year have significant snowfall.

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