Sullivan, IN Climate

Sullivan, IN has a humid continental climate with hot and humid summers and cold winters. In the summer months, temperatures range from the low 70s to the high 80s Fahrenheit with ample precipitation. Winters in Sullivan are usually cold and dry, with temperatures ranging from near 20°F to around 40°F. The area generally receives about 39 inches of rain per year, spread out across the four seasons.

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

Sullivan averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 197 sunny days per year in Sullivan. The US average is 205 sunny days.

Sullivan 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 87 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 is 7.1 (10=best), which means it is more comfortable than most places in Indiana.

7.9 Summer - 5.3 Winter

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

Climate	Sullivan, Indiana	United States
	44.2 in.	38.1 in.
	12.0 in.	27.8 in.
	115.6 days	106.2 days
	197 days	205 days
	87.1°	85.8°
	20.7°	21.7°
	7.1	7
	4.2	4.3
	528 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 with an average high temperature of 87.1°, which ranks it as warmer than most places in Indiana. In Sullivan, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sullivan are September, May and June.

In Sullivan, there are 27.0 days annually when the high temperature is over 90°, which is one of the hottest places in Indiana.

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

In Sullivan, there are 107.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Indiana.

In Sullivan, there are 2.6 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 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.

May is the wettest month in Sullivan with 5.1 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 44.2 inches in Sullivan means that it is wetter than most places in Indiana.

May is the rainiest month in Sullivan with 12.5 days of rain, and September is the driest month with only 7.4 rainy days. There are 115.6 rainy days annually in Sullivan, which is about average compared to other 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 12.0 inches in Sullivan means that it is less snowy than most places in Indiana. January is the snowiest month in Sullivan with 4.1 inches of snow, and 4 months of the year have significant snowfall.