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United States › South Dakota › Dewey County › Climate Station MOBRIDGE MUNI AP, SD US Distance 34.6 mi Normals 1991–2020

30-year climate normals

Dewey County Climate and Weather Averages

Hottest month — July

87.4°

average daily high. The coldest month is January, averaging a low of 6.4°F.

Dewey County gets 17.99" of precipitation a year and 31" of snow, and 46% 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 27.1° 6.4° 0.38" 6.3"
February 31.6° 10.7° 0.65" 6.4"
March 44.6° 22.2° 0.71" 4.1"
April 58.6° 33.0° 1.58" 3.2"
May 70.2° 45.0° 2.94" 0.0"
June 80.1° 55.7° 3.08" 0.0"
July 87.4° 61.6° 2.33" 0.0"
August 86.0° 59.6° 2.05" 0.0"
September 76.5° 49.9° 1.52" 0.0"
October 60.4° 36.5° 1.81" 1.7"
November 44.2° 22.8° 0.43" 3.6"
December 31.6° 12.0° 0.51" 5.7"

Rainfall by month

Dewey County has a distinct wet season. 46% of the year's precipitation arrives in May, Jun, Jul.

January 0.38"
February 0.65"
March 0.71"
April 1.58"
May 2.94"
June 3.08"
July 2.33"
August 2.05"
September 1.52"
October 1.81"
November 0.43"
December 0.51"
Annual total 17.99"

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 812
Heating degree days How much heating the climate demands 7,549
Approximate annual cooling cost At 15.73¢/kWh, South Dakota average $128
Approximate annual electric heating cost Lower where heating is gas rather than electric $416

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 Dewey County, where electricity is one line of eight.

Common questions

What is the weather like in Dewey County?

Dewey County averages a high of 87.4°F in July and a low of 6.4°F in January. Annual precipitation is 17.99 inches, including 31 inches of snow.

When is the rainy season in Dewey County?

The wettest stretch is May, Jun, Jul, which accounts for 46% 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 Dewey County?

The average daily high in July, the hottest month, is 87.4°F. That drives 812 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Dewey County?

Yes. Dewey County averages 31 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MOBRIDGE MUNI AP, SD US (USW00094052), 34.6 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.