TODAY SEP20
TEMPERATURE55
HUMIDITY69
PRESSURE
WIND COND.141 4.2
  • 6538Fri
  • 6638Sat
  • 6944Sun20%
  • 6844Mon
  • 7349Tue
daynightWeather update from ROUND BUTTE at
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Weather Quick Facts

  • The highest monthly average temperature in St. Ignatius for July is 71 degrees
  • The lowest monthly average temperature in St. Ignatius for December is 23.7 degrees
  • The most monthly precipitation in St. Ignatius occurs in June with 2 inches
  • The air quality index in St. Ignatius is 5% better than the national average
  • The pollution index in St. Ignatius is 69% better than the national average

Compare St. Ignatius, MT Weather

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      St. Ignatius 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
      January16°F34°F25°F0.9"
      February21°F40°F30°F1.0"
      March26°F51°F38°F1.0"
      April31°F60°F44°F1.1"
      May38°F69°F53°F1.4"
      June45°F78°F61°F2.0"
      July51°F91°F71°F0.6"
      August49°F88°F68°F0.7"
      September42°F77°F58°F1.0"
      October33°F59°F45°F1.2"
      November24°F44°F33°F1.4"
      December15°F32°F24°F1.2"

      St. Ignatius 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.
      IndexSt. IgnatiusMontanaNational
      Air quality index403442
      Pollution index848,303834,4732,726,193

      St. Ignatius air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality224
      Days with moderate air quality137
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality1

      St. Ignatius air quality information

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

      Average monthly St. Ignatius temperature with heat index

      St. Ignatius monthly precipitation with daily maximum

      St. Ignatius monthly snow depth with daily maximum

      St. Ignatius monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Kicking Horse, MT1094020.0%
      Arlee, MT5924020.0%
      Old Agency, MT614020.0%
      Charlo, MT2614020.0%
      Ravalli, MT2204020.0%
      St. Ignatius, MT7854020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Greenville, CA785468.0%
      Paragon Estates, CO785476.0%
      Attapulgus, GA7854020.0%
      Milan, GA7852648.0%
      Ubly, MI7852648.0%
      St. Ignatius, MT7854020.0%
      Source: The St. Ignatius, 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.