30-year climate normals

Clark County Climate and Weather Averages

Hottest month — July

81.7°

average daily high. The coldest month is January, averaging a low of 3.5°F.

Clark County gets 24.39" of precipitation a year, and 44% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	21.1°	3.5°	0.62"
February	25.9°	7.1°	0.62"
March	38.7°	18.9°	1.03"
April	53.3°	31.5°	2.14"
May	66.4°	44.6°	3.10"
June	76.5°	55.9°	4.14"
July	81.7°	60.7°	3.61"
August	80.1°	58.1°	2.74"
September	71.8°	48.9°	2.70"
October	56.5°	35.2°	2.21"
November	40.0°	21.3°	0.78"
December	26.6°	9.8°	0.70"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 44% falling in the wettest three months (May, Jun, Jul).

January 0.62"

February 0.62"

March 1.03"

April 2.14"

May 3.10"

June 4.14"

July 3.61"

August 2.74"

September 2.70"

October 2.21"

November 0.78"

December 0.70"

Annual total 24.39"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 540

Heating degree days How much heating the climate demands 8,486

Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $85

Approximate annual electric heating cost Lower where heating is gas rather than electric $467

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Clark County, where electricity is one line of eight.

Common questions

What is the weather like in Clark County?

Clark County averages a high of 81.7°F in July and a low of 3.5°F in January. Annual precipitation is 24.39 inches, with essentially no snow.

When is the rainy season in Clark County?

The wettest stretch is May, Jun, Jul, which accounts for 44% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Clark County?

The average daily high in July, the hottest month, is 81.7°F. That drives 540 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Clark County?

Effectively no. Measurable snowfall is rare in Clark County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CLARK, SD US (USC00391739), 1.9 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, South Dakota residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.