TODAY JUN18
TEMPERATURE59
HUMIDITY72
PRESSURE30.07
WIND COND.
  • 6947Tue30%30%
  • 7047Wed30%20%
  • 7951Thu
  • 8048Fri
  • 7447Sat
daynightWeather update from Riverton, Riverton Regional Airport at

Johnstown Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January-25°F57°F20°F0.1"
February-26°F59°F27°F0.1"
March-6°F73°F36°F0.3"
April10°F84°F43°F0.4"
May25°F89°F54°F1.5"
June34°F99°F63°F0.6"
July43°F102°F74°F0.6"
August41°F99°F70°F0.5"
September30°F92°F59°F0.4"
October0°F80°F44°F0.6"
November2°F69°F35°F0.1"
December-17°F57°F19°F0.2"

Did you know?

  • The highest monthly average temperature in Johnstown for July is 74 degrees.
  • The lowest monthly average temperature in Johnstown for December is 19 degrees.
  • The most monthly precipitation in Johnstown occurs in May with 1.5 inches.
  • The air quality index in Johnstown is 15% better than the national average.
  • The pollution index in Johnstown is 94% better than the national average.

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Compare Johnstown, WY Weather To Other Cities

Johnstown air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexJohnstownWyomingNational
Air quality index423950
Pollution index270,1671,082,0855,066,862

Johnstown air quality information

MeasurementTotal
Days measured365
Days with good air quality330
Days with moderate air quality35
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Johnstown air quality information

PollutantTotal
Arsenic0.000%
Benzene0.002%
Carbon Tetrachloride0.000%
Lead0.000%
Mercury0.000%

Average monthly Johnstown temperature with heat index

Johnstown monthly precipitation with daily maximum

Johnstown monthly snow depth with daily maximum

Johnstown monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Arapahoe, WY1,5494216%
Hudson, WY5104216%
Boulder Flats, WY3774216%
Pavillion, WY2264216%
Ethete, WY1,7514216%
Johnstown, WY2024216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Larrabee, IA2024118%
Ross, TX2023922%
Jenera, OH2023040%
Kansas, AL2023040%
Sweet Water Village, AZ2027448%
Johnstown, WY2024216%
Source: The Johnstown, WY weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.