Sully County, SD Climate

Sully, SD County has a humid continental climate. Summers in Sully are warm and humid while winters are cold and snowy. Rainfall is abundant throughout the year, with snowfall accumulation averaging around 45 inches. The average temperature for the year is 48 degrees Fahrenheit, with July being the hottest month, averaging around 80 degrees Fahrenheit and January being the coldest month, averaging around 19 degrees Fahrenheit. The region experiences all four distinct seasons which offer a variety of outdoor activities and opportunities throughout the year.

Sully County, South Dakota gets 20 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Sully County averages 43 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 206 sunny days per year in Sully County. The US average is 205 sunny days.

Sully County gets some kind of precipitation, on average, 80 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 5
Rain: averages 20 inches of rain a year
Snow: averages 43 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Sully County is 6.7 (10=best), which means it is less comfortable than most places in South Dakota.

9.1 Summer - 4.3 Winter

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

Climate	Sully, South Dakota	United States
	20.0 in.	38.1 in.
	42.7 in.	27.8 in.
	79.6 days	106.2 days
	206 days	205 days
	86.5°	85.8°
	5.3°	21.7°
	6.7	7
	3.8	4.3
	1799 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 Sully County with an average high temperature of 86.5°, which ranks it as warmer than most places in South Dakota. In Sully County, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sully County are June, September and August.

In Sully County, there are 26.3 days annually when the high temperature is over 90°, which is hotter than most places in South Dakota.

January has the coldest nighttime temperatures for Sully County with an average of 5.3°. This is colder than most places in South Dakota.

In Sully County, there are 174.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in South Dakota.

In Sully County, there are 28.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in South Dakota.

Humidity in Sully County is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

June is the wettest month in Sully County with 3.4 inches of rain, and the driest month is December with 0.5 inches. The wettest season is Autumn with 42% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 20.0 inches in Sully County means that it is drier than most places in South Dakota.

June is the rainiest month in Sully County with 9.8 days of rain, and January is the driest month with only 4.7 rainy days. There are 79.6 rainy days annually in Sully County, which is about average compared to other places in South Dakota. The rainiest season is Autumn when it rains 32% of the time and the driest is Spring with only a 18% chance of a rainy day.

An annual snowfall of 42.7 inches in Sully County means that it is snowier than most places in South Dakota. February is the snowiest month in Sully County with 8.6 inches of snow, and 7 months of the year have significant snowfall.

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