TODAY MAY18
TEMPERATURE70
HUMIDITY23
PRESSURE
WIND COND.240 13
  • 7239Tue
  • 5636Wed40%80%
  • 4332Thu80%
  • 4332Fri
  • 4934Sat
daynightWeather update from Helena Regional Airport at

Key findings

  • 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 20% better than the national average
  • The pollution index in Helena is 77% 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 index403450
      Pollution index1,148,190685,9255,066,862

      Helena air quality information

      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

      Helena air quality information

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Spokane Creek, MT3174020%
      Helena Valley Southeast, MT7,5434020%
      South Hills, MT5294020%
      Clancy, MT1,6124020%
      East Helena, MT2,2864020%
      Helena, MT30,1024020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Myrtle Beach, SC30,1061472%
      Orcutt, CA30,109468%
      Burlingame, CA30,1184314%
      Holly Springs, NC30,126468%
      Lawrenceville, GA30,1273726%
      Helena, MT30,1024020%
      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.