TODAY FEB27
TEMPERATURE
HUMIDITY58
PRESSURE29.74
WIND COND.20 18.4
  • 3811Sat20%
  • 3812Sun
  • 4919Mon
  • 5523Tue
  • 5625Wed
daynightWeather update from Fort Collins/Loveland, Fort Collins-Loveland Municipal Airport at

Key findings

  • The highest monthly average temperature in Johnstown for July is 72 degrees
  • The lowest monthly average temperature in Johnstown for December is 27 degrees
  • The most monthly precipitation in Johnstown occurs in May with 4.4 inches
  • The air quality index in Johnstown is 10% better than the national average
  • The pollution index in Johnstown is 87% worse than the national average

Compare Johnstown, CO Weather

      vs
      How would you rate the weather in Johnstown?
      Write a review to give others more information about this area.
      How would you rate the air quality in Johnstown?
      Write a review to give others more information about this area.
      See all Johnstown poll results

      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 index453850
      Pollution index9,490,1602,034,6195,066,862

      Johnstown air quality information

      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

      Johnstown air quality information

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Milliken, CO6,1574510%
      Greeley, CO98,9754510%
      Severance, CO3,6034510%
      Platteville, CO2,6284510%
      La Salle, CO2,5884510%
      Johnstown, CO14,3794510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Lindenhurst, IL14,3803922%
      Robbinsdale, MN14,382468%
      College, AK14,3723824%
      Chicago Ridge, IL14,3685510%
      Canton, IL14,3974118%
      Johnstown, CO14,3794510%
      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.