Dewey County, SD Climate

Dewey, SD County has a continental climate, with warm summers and cold winters. The average temperatures range from -11 degrees Fahrenheit in the winter to 81 degrees Fahrenheit in the summer. Precipitation averages around 18 inches a year spread throughout the year with plenty of sunshine hours. The area is a great place to experience all four seasons with mild temperatures and plenty of opportunities for outdoor recreation.

Dewey County, South Dakota gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Dewey County averages 38 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Dewey County. The US average is 205 sunny days.

Dewey County gets some kind of precipitation, on average, 72 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 8
Rain: averages 18 inches of rain a year
Snow: averages 38 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Dewey County is 6.8 (10=best), which means it is about average compared to other places in South Dakota.

9.1 Summer - 4.5 Winter

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

Climate	Dewey, South Dakota	United States
	18.3 in.	38.1 in.
	38.4 in.	27.8 in.
	72.2 days	106.2 days
	201 days	205 days
	86.7°	85.8°
	7.7°	21.7°
	6.8	7
	3	4.3
	1999 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 Dewey County with an average high temperature of 86.7°, which ranks it as warmer than most places in South Dakota. In Dewey County, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Dewey County are June, September and August.

In Dewey County, there are 28.2 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 Dewey County with an average of 7.7°. This is about average compared to other places in South Dakota.

In Dewey County, there are 168.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in South Dakota.

In Dewey County, there are 25.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Dakota.

Humidity in Dewey 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 Dewey County with 3.3 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 42% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 18.3 inches in Dewey County means that it is drier than most places in South Dakota.

June is the rainiest month in Dewey County with 9.7 days of rain, and January is the driest month with only 4.0 rainy days. There are 72.2 rainy days annually in Dewey County, which is less rainy than most places in South Dakota. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 17% chance of a rainy day.

An annual snowfall of 38.4 inches in Dewey County means that it is about average compared to other places in South Dakota. March is the snowiest month in Dewey County with 7.9 inches of snow, and 7 months of the year have significant snowfall.

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