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United States › South Dakota › Marshall County › Climate Station ROY LAKE, SD US Distance 7.4 mi Normals 1991–2020

30-year climate normals

Marshall County Climate and Weather Averages

Hottest month — July

81.8°

average daily high. The coldest month is January, averaging a low of 2.6°F.

Marshall County gets 24.99" of precipitation a year and 48.1" of snow, and 47% 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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 21.6° 2.6° 0.55" 6.6"
February 25.6° 5.2° 0.63" 9.2"
March 37.8° 17.6° 0.98" 7.0"
April 53.0° 31.9° 2.06" 7.2"
May 66.9° 45.9° 3.15" 0.2"
June 76.4° 57.7° 4.27" 0.0"
July 81.8° 62.2° 4.41" 0.0"
August 80.5° 60.2° 2.62" 0.0"
September 71.7° 51.0° 2.50" 0.0"
October 56.8° 37.3° 2.21" 2.5"
November 40.1° 23.0° 0.85" 4.3"
December 27.2° 9.6° 0.76" 11.1"

Rainfall by month

Marshall County has a distinct wet season. 47% of the year's precipitation arrives in May, Jun, Jul.

January 0.55"
February 0.63"
March 0.98"
April 2.06"
May 3.15"
June 4.27"
July 4.41"
August 2.62"
September 2.50"
October 2.21"
November 0.85"
December 0.76"
Annual total 24.99"

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 619
Heating degree days How much heating the climate demands 8,417
Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $97
Approximate annual electric heating cost Lower where heating is gas rather than electric $463

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 Marshall County, where electricity is one line of eight.

Common questions

What is the weather like in Marshall County?

Marshall County averages a high of 81.8°F in July and a low of 2.6°F in January. Annual precipitation is 24.99 inches, including 48.1 inches of snow.

When is the rainy season in Marshall County?

The wettest stretch is May, Jun, Jul, which accounts for 47% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Marshall County?

The average daily high in July, the hottest month, is 81.8°F. That drives 619 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Marshall County?

Yes. Marshall County averages 48.1 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ROY LAKE, SD US (USC00397326), 7.4 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.