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Key findings

  • The highest monthly average temperature in Darby for July is 68.2 degrees
  • The lowest monthly average temperature in Darby for December is 21.3 degrees
  • The most monthly precipitation in Darby occurs in September with 6.3 inches
  • The air quality index in Darby is 20% better than the national average
  • The pollution index in Darby is 69% better than the national average

Compare Darby, MT Weather

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      Darby 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
      January19°F31°F25°F1.6"
      February21°F35°F27°F1.3"
      March26°F46°F36°F2.5"
      April30°F55°F43°F2.4"
      May37°F64°F51°F4.2"
      June45°F71°F59°F3.0"
      July50°F85°F68°F4.1"
      August46°F82°F65°F4.6"
      September40°F73°F57°F6.3"
      October33°F55°F44°F3.0"
      November24°F39°F31°F2.0"
      December15°F28°F21°F1.8"

      Darby 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.
      IndexDarbyMontanaNational
      Air quality index403450
      Pollution index848,303834,4732,726,193

      Darby 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

      Darby air quality information

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

      Average monthly Darby temperature with heat index

      Darby monthly precipitation with daily maximum

      Darby monthly snow depth with daily maximum

      Darby monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Sula, MT612060.0%
      Charlos Heights, MT1684020.0%
      Conner, MT1284020.0%
      Darby, MT6814020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Bellamy, AL6813628.0%
      Dyer, AR6813628.0%
      Secretary, MD6814118.0%
      Bloomingdale, MI6813922.0%
      Mathiston, MS6813334.0%
      Darby, MT6814020.0%
      Source: The Darby, 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.