Lyman County, SD Climate

Lyman County, South Dakota has a continental climate, with hot summers and cold winters. Summers average in the mid-80s Fahrenheit (high 20s Celsius) while winter temperatures tend to remain in the low 20s Fahrenheit (-6 degrees Celsius). Precipitation occurs throughout the year, though it is usually light. Snowfall is moderate, typically ranging from 15-20 inches per season. Spring and autumn are generally mild and pleasant times of the year.

Lyman County, South Dakota gets 21 inches of rain, on average, per year. The US average is 38 inches of rain per year.

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

On average, there are 225 sunny days per year in Lyman County. The US average is 205 sunny days.

Lyman County gets some kind of precipitation, on average, 78 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 88 degrees
Winter Low: the January low is 9
Rain: averages 21 inches of rain a year
Snow: averages 38 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Lyman County is 6.9 (10=best), which means it is more comfortable than most places in South Dakota.

8.9 Summer - 4.7 Winter

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

Climate	Lyman, South Dakota	United States
	20.6 in.	38.1 in.
	38.2 in.	27.8 in.
	78.2 days	106.2 days
	225 days	205 days
	88.1°	85.8°
	9.0°	21.7°
	6.9	7
	3.5	4.3
	1766 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 Lyman County with an average high temperature of 88.1°, which ranks it as warmer than most places in South Dakota. In Lyman County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lyman County are September, June and May.

In Lyman County, there are 32.7 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 Lyman County with an average of 9.0°. This is warmer than most places in South Dakota.

In Lyman County, there are 164.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in South Dakota.

In Lyman County, there are 21.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in South Dakota.

Humidity in Lyman 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 Lyman County with 3.6 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 41% of yearly precipitation and 6% occurs in Spring, which is the driest season. The annual rainfall of 20.6 inches in Lyman County means that it is drier than most places in South Dakota.

June is the rainiest month in Lyman County with 10.1 days of rain, and January is the driest month with only 3.9 rainy days. There are 78.2 rainy days annually in Lyman 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 15% chance of a rainy day.

An annual snowfall of 38.2 inches in Lyman County means that it is about average compared to other places in South Dakota. March is the snowiest month in Lyman County with 8.3 inches of snow, and 7 months of the year have significant snowfall.

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