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United States › Wyoming › Johnson County › Climate Station BILLY CREEK, WY US Distance 9 mi Normals 1991–2020

30-year climate normals

Johnson County Climate and Weather Averages

Hottest month — July

85.7°

average daily high. The coldest month is January, averaging a low of 11.8°F.

Johnson County gets 13.45" of precipitation a year and 35.7" 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 38.9° 11.8° 0.33" 5.0"
February 39.5° 14.8° 0.40" 5.2"
March 48.7° 22.4° 0.63" 5.5"
April 55.3° 29.7° 1.54" 6.2"
May 64.2° 39.1° 2.79" 1.1"
June 75.7° 48.0° 2.08" 0.0"
July 85.7° 54.5° 1.55" 0.0"
August 84.0° 52.7° 0.84" 0.0"
September 74.3° 43.1° 1.29" 0.2"
October 59.6° 30.8° 1.13" 3.1"
November 47.9° 20.7° 0.52" 4.8"
December 39.1° 12.4° 0.35" 4.6"

Rainfall by month

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

January 0.33"
February 0.40"
March 0.63"
April 1.54"
May 2.79"
June 2.08"
July 1.55"
August 0.84"
September 1.29"
October 1.13"
November 0.52"
December 0.35"
Annual total 13.45"

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 452
Heating degree days How much heating the climate demands 7,516
Approximate annual cooling cost At 14.8¢/kWh, Wyoming average $67
Approximate annual electric heating cost Lower where heating is gas rather than electric $389

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 Johnson County, where electricity is one line of eight.

Common questions

What is the weather like in Johnson County?

Johnson County averages a high of 85.7°F in July and a low of 11.8°F in January. Annual precipitation is 13.45 inches, including 35.7 inches of snow.

When is the rainy season in Johnson 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 Johnson County?

The average daily high in July, the hottest month, is 85.7°F. That drives 452 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Johnson County?

Yes. Johnson County averages 35.7 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BILLY CREEK, WY US (USC00480740), 9 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.