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United States › North Dakota › Williams County › Climate Station WILLISTON SLOULIN INTL AP, ND US Distance 14 mi Normals 1991–2020

30-year climate normals

Williams County Climate and Weather Averages

Hottest month — July

84.5°

average daily high. The coldest month is January, averaging a low of 1.0°F.

Williams County gets 15.11" of precipitation a year and 48.2" of snow, and 48% 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 22.1° 1.0° 0.56" 11.2"
February 26.7° 5.5° 0.48" 6.7"
March 40.1° 17.5° 0.63" 6.4"
April 55.6° 29.2° 1.05" 3.7"
May 67.4° 40.2° 2.10" 0.9"
June 76.7° 50.2° 2.64" 0.0"
July 84.5° 56.3° 2.48" 0.0"
August 83.9° 54.0° 1.57" 0.0"
September 72.6° 43.5° 1.36" 0.0"
October 55.9° 30.4° 0.94" 2.6"
November 38.4° 17.1° 0.67" 6.3"
December 26.1° 6.1° 0.63" 10.4"

Rainfall by month

Williams County has a distinct wet season. 48% of the year's precipitation arrives in May, Jun, Jul.

January 0.56"
February 0.48"
March 0.63"
April 1.05"
May 2.10"
June 2.64"
July 2.48"
August 1.57"
September 1.36"
October 0.94"
November 0.67"
December 0.63"
Annual total 15.11"

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 457
Heating degree days How much heating the climate demands 8,906
Approximate annual cooling cost At 13.61¢/kWh, North Dakota average $62
Approximate annual electric heating cost Lower where heating is gas rather than electric $424

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 Williams County, where electricity is one line of eight.

Common questions

What is the weather like in Williams County?

Williams County averages a high of 84.5°F in July and a low of 1.0°F in January. Annual precipitation is 15.11 inches, including 48.2 inches of snow.

When is the rainy season in Williams County?

The wettest stretch is May, Jun, Jul, which accounts for 48% 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 Williams County?

The average daily high in July, the hottest month, is 84.5°F. That drives 457 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Williams County?

Yes. Williams County averages 48.2 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station WILLISTON SLOULIN INTL AP, ND US (USW00094014), 14 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, North Dakota residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.