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United States › South Dakota › Roberts County › Climate Station SISSETON MUNI AP, SD US Distance 3.8 mi Normals 1991–2020

30-year climate normals

Roberts County Climate and Weather Averages

Hottest month — July

83.1°

average daily high. The coldest month is January, averaging a low of 4.1°F.

Roberts County gets 22.94" of precipitation a year and 36.3" of snow, and 43% 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 22.6° 4.1° 0.63" 6.2"
February 27.0° 8.2° 0.70" 7.3"
March 39.5° 20.4° 1.11" 6.1"
April 55.0° 32.5° 2.09" 5.6"
May 69.2° 45.3° 2.79" 0.0"
June 78.4° 56.0° 3.50" 0.0"
July 83.1° 59.8° 3.49" 0.0"
August 80.9° 56.9° 2.61" 0.0"
September 73.5° 48.0° 2.45" 0.0"
October 58.0° 35.5° 2.33" 1.0"
November 41.5° 22.4° 0.64" 4.6"
December 27.8° 10.4° 0.60" 5.5"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 43% falling in the wettest three months (May, Jun, Jul).

January 0.63"
February 0.70"
March 1.11"
April 2.09"
May 2.79"
June 3.50"
July 3.49"
August 2.61"
September 2.45"
October 2.33"
November 0.64"
December 0.60"
Annual total 22.94"

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 566
Heating degree days How much heating the climate demands 8,179
Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $89
Approximate annual electric heating cost Lower where heating is gas rather than electric $450

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 Roberts County, where electricity is one line of eight.

Common questions

What is the weather like in Roberts County?

Roberts County averages a high of 83.1°F in July and a low of 4.1°F in January. Annual precipitation is 22.94 inches, including 36.3 inches of snow.

When is the rainy season in Roberts County?

The wettest stretch is May, Jun, Jul, which accounts for 43% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Roberts County?

The average daily high in July, the hottest month, is 83.1°F. That drives 566 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Roberts County?

Yes. Roberts County averages 36.3 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SISSETON MUNI AP, SD US (USW00094993), 3.8 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.