TODAY DEC22
TEMPERATURE42
HUMIDITY32
PRESSURE101900
WIND COND.40 7.6
  • 5932Sun
  • 5528Mon
  • 5227Tue
  • 4725
  • 4926Thu
daynightWeather update from Fort Collins/Loveland - Northern Colorado Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Johnstown for July is 72 degrees
  • The lowest monthly average temperature in Johnstown for December is 27.2 degrees
  • The most monthly precipitation in Johnstown occurs in May with 4.4 inches
  • The air quality index in Johnstown is 7% worse than the national average
  • The pollution index in Johnstown is 248% worse than the national average

Compare Johnstown, CO Weather

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      Johnstown Average Temperature

      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
      January18°F43°F29°F2.6"
      February20°F47°F32°F0.5"
      March28°F59°F42°F1.4"
      April34°F64°F47°F3.7"
      May43°F71°F55°F4.4"
      June52°F85°F68°F2.1"
      July57°F90°F72°F2.6"
      August56°F87°F71°F2.6"
      September50°F81°F64°F1.8"
      October38°F66°F50°F2.2"
      November27°F55°F39°F1.2"
      December16°F42°F27°F0.4"

      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.
      IndexJohnstownColoradoNational
      Air quality index453842
      Pollution index9,490,1602,068,3422,726,193

      Johnstown air quality

      MeasurementTotal
      Days measured365
      Days with good air quality252
      Days with moderate air quality110
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.004%
      Benzene0.140%
      Carbon Tetrachloride0.020%
      Lead0.020%
      Mercury0.001%

      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

      CityPopulationAir Quality IndexNational Avg.
      Mead, CO4,9784510.0%
      Garden City, CO2084510.0%
      Eaton, CO5,6464510.0%
      Milliken, CO7,8624510.0%
      Greeley, CO107,4454510.0%
      Johnstown, CO14,3574510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Fort Campbell North, KY14,3634020.0%
      Ozark, AL14,3503530.0%
      Southern Pines, NC14,3472942.0%
      Saint-Charles-Borromée, QC14,372n/a 
      Lavaltrie, QC14,339n/a 
      Johnstown, CO14,3574510.0%
      Source: The Johnstown, CO 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.