TODAY NOV07
TEMPERATURE34
HUMIDITY59
PRESSURE
WIND COND.
  • 5723Fri
  • 5631Sat
  • 5331Sun
  • 5529
  • 4524Tue
daynightWeather update from Helena Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Helena for July is 72.7 degrees
  • The lowest monthly average temperature in Helena for December is 21.8 degrees
  • The most monthly precipitation in Helena occurs in June with 2 inches
  • The air quality index in Helena is 5% better than the national average
  • The pollution index in Helena is 58% better than the national average

Compare Helena, MT Weather

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      Helena 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
      January13°F35°F24°F0.6"
      February18°F41°F28°F0.7"
      March25°F52°F38°F0.5"
      April31°F60°F44°F0.9"
      May39°F69°F53°F1.8"
      June47°F79°F63°F2.0"
      July55°F91°F73°F0.7"
      August52°F88°F69°F1.1"
      September44°F77°F59°F1.1"
      October34°F62°F46°F0.8"
      November23°F47°F34°F0.8"
      December12°F33°F22°F0.8"

      Helena 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.
      IndexHelenaMontanaNational
      Air quality index403442
      Pollution index1,148,190834,4732,726,193

      Helena air quality

      MeasurementTotal
      Days measured365
      Days with good air quality288
      Days with moderate air quality75
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.020%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.000%

      Average monthly Helena temperature with heat index

      Helena monthly precipitation with daily maximum

      Helena monthly snow depth with daily maximum

      Helena monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Jefferson City, MT5964020.0%
      Helena Valley Northeast, MT3,5194020.0%
      Helena West Side, MT1,6564020.0%
      Montana City, MT2,8214020.0%
      Helena Valley Northwest, MT4,2564020.0%
      Helena, MT32,6554020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Orangeville, ON32,668n/a 
      Matthews, NC32,682492.0%
      Uniondale, NY32,621512.0%
      St. Charles, IL32,6125510.0%
      Florence, KY32,721548.0%
      Helena, MT32,6554020.0%
      Source: The Helena, MT 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.