TODAY NOV22
TEMPERATURE17
HUMIDITY89
PRESSURE
WIND COND.332 10.8
  • 2216Fri90%30%
  • 245Sat100%60%
  • 13-4Sun30%
  • 141Mon
  • 296Tue
daynightWeather update from CONRAD AG RC at
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Weather Quick Facts

  • The highest monthly average temperature in Shelby for July is 67.2 degrees
  • The lowest monthly average temperature in Shelby for December is 20.5 degrees
  • The most monthly precipitation in Shelby occurs in June with 2.7 inches
  • The air quality index in Shelby is 50% better than the national average
  • The pollution index in Shelby is 90% better than the national average

Compare Shelby, MT Weather

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      Shelby 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
      January14°F35°F24°F0.1"
      February15°F37°F25°F0.1"
      March23°F46°F33°F0.2"
      April29°F54°F41°F0.4"
      May38°F64°F50°F1.8"
      June45°F72°F58°F2.7"
      July51°F84°F67°F1.0"
      August48°F81°F64°F0.6"
      September41°F72°F55°F1.8"
      October32°F55°F42°F0.5"
      November25°F45°F34°F0.1"
      December11°F31°F21°F0.1"

      Shelby 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.
      IndexShelbyMontanaNational
      Air quality index213442
      Pollution index284,954834,4732,726,193

      Shelby air quality

      MeasurementTotal
      Days measured363
      Days with good air quality350
      Days with moderate air quality12
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.000%
      Lead0.003%
      Mercury0.000%

      Average monthly Shelby temperature with heat index

      Shelby monthly precipitation with daily maximum

      Shelby monthly snow depth with daily maximum

      Shelby monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Shelby, MT2,8752158.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Homer, LA2,8753530.0%
      Harrisburg, AR2,8744510.0%
      Syracuse, IN2,8743726.0%
      Brandenburg, KY2,8743922.0%
      Saint-Isidore, QC2,874n/a 
      Shelby, MT2,8752158.0%
      Source: The Shelby, 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.