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United States › Wyoming › Sweetwater County › Climate Station ROCK SPRINGS AP, WY US Distance 10.2 mi Normals 1991–2020

30-year climate normals

Sweetwater County Climate and Weather Averages

Hottest month — July

84.1°

average daily high. The coldest month is December, averaging a low of 13.4°F.

Sweetwater County gets 7.55" of precipitation a year and 54" of snow, and 38% of it falls in Apr, May, Jun.

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 29.5° 13.6° 0.38" 8.2"
February 32.9° 15.7° 0.37" 7.9"
March 43.9° 24.1° 0.58" 6.4"
April 52.8° 29.7° 0.91" 8.8"
May 63.2° 38.4° 1.27" 2.7"
June 75.0° 47.0° 0.70" 0.4"
July 84.1° 54.8° 0.47" 0.0"
August 81.5° 53.1° 0.56" 0.0"
September 70.7° 43.9° 0.79" 1.2"
October 56.0° 32.9° 0.81" 6.6"
November 40.5° 21.8° 0.40" 6.0"
December 29.5° 13.4° 0.31" 5.8"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 38% falling in the wettest three months (Apr, May, Jun).

January 0.38"
February 0.37"
March 0.58"
April 0.91"
May 1.27"
June 0.70"
July 0.47"
August 0.56"
September 0.79"
October 0.81"
November 0.40"
December 0.31"
Annual total 7.55"

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 319
Heating degree days How much heating the climate demands 8,064
Approximate annual cooling cost At 14.8¢/kWh, Wyoming average $47
Approximate annual electric heating cost Lower where heating is gas rather than electric $418

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 Sweetwater County, where electricity is one line of eight.

Common questions

What is the weather like in Sweetwater County?

Sweetwater County averages a high of 84.1°F in July and a low of 13.4°F in December. Annual precipitation is 7.55 inches, including 54 inches of snow.

When is the rainy season in Sweetwater County?

The wettest stretch is Apr, May, Jun, which accounts for 38% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Sweetwater County?

The average daily high in July, the hottest month, is 84.1°F. That drives 319 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sweetwater County?

Yes. Sweetwater County averages 54 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ROCK SPRINGS AP, WY US (USW00024027), 10.2 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, Wyoming residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.