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United States › South Dakota › Walworth County › Climate Station SELBY, SD US Distance 5.7 mi Normals 1991–2020

30-year climate normals

Walworth County Climate and Weather Averages

Hottest month — July

84.1°

average daily high. The coldest month is January, averaging a low of 4.0°F.

Walworth County gets 19.24" of precipitation a year and 33.4" 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 23.2° 4.0° 0.40" 4.0"
February 27.7° 7.6° 0.57" 7.0"
March 40.5° 19.3° 0.79" 5.1"
April 54.9° 31.0° 1.60" 4.4"
May 67.3° 44.0° 2.82" 0.2"
June 77.5° 54.9° 3.45" 0.0"
July 84.1° 60.3° 2.68" 0.0"
August 82.8° 57.7° 2.41" 0.0"
September 73.7° 48.2° 1.64" 0.0"
October 57.5° 34.0° 1.83" 1.6"
November 40.8° 20.6° 0.54" 3.5"
December 28.0° 9.7° 0.51" 7.6"

Rainfall by month

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

January 0.40"
February 0.57"
March 0.79"
April 1.60"
May 2.82"
June 3.45"
July 2.68"
August 2.41"
September 1.64"
October 1.83"
November 0.54"
December 0.51"
Annual total 19.24"

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 623
Heating degree days How much heating the climate demands 8,337
Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $98
Approximate annual electric heating cost Lower where heating is gas rather than electric $459

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 Walworth County, where electricity is one line of eight.

Common questions

What is the weather like in Walworth County?

Walworth County averages a high of 84.1°F in July and a low of 4.0°F in January. Annual precipitation is 19.24 inches, including 33.4 inches of snow.

When is the rainy season in Walworth 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 Walworth County?

The average daily high in July, the hottest month, is 84.1°F. That drives 623 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Walworth County?

Yes. Walworth County averages 33.4 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SELBY, SD US (USC00397545), 5.7 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.