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Key findings

  • The highest monthly average temperature in St. Mary's for July is 55.3 degrees
  • The lowest monthly average temperature in St. Mary's for March is 7.9 degrees
  • The most monthly precipitation in St. Mary's occurs in August with 4.8 inches
  • The air quality index in St. Mary's is 38% better than the national average
  • The pollution index in St. Mary's is 93% better than the national average

Compare St. Mary's, AK Weather

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      St. Mary's 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
      January7°F17°F12°F1.9"
      February6°F18°F12°F0.4"
      March2°F15°F8°F0.3"
      April17°F33°F24°F1.4"
      May32°F52°F41°F2.0"
      June43°F62°F52°F2.5"
      July47°F65°F55°F1.8"
      August48°F61°F54°F4.8"
      September42°F51°F46°F2.7"
      October25°F35°F30°F2.2"
      November10°F19°F14°F0.5"
      December7°F19°F13°F0.2"

      St. Mary's 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. Mary'sAlaskaNational
      Air quality index313050
      Pollution index349,53311,990,2865,066,862

      St. Mary's air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality262
      Days with moderate air quality92
      Days w/ poor A.Q. for sensitive groups7
      Days with unhealthy air quality4

      St. Mary's air quality information

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

      Average monthly St. Mary's temperature with heat index

      St. Mary's monthly precipitation with daily maximum

      St. Mary's monthly snow depth with daily maximum

      St. Mary's monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Pilot Station, AK6003138%
      Pitkas Point, AK1283138%
      St. Mary's, AK5213138%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Scammon Bay, AK5213138%
      Cross Roads, PA5214118%
      Montreat, NC5214412%
      Williamsfield, IL5214118%
      Glen Elder, KS5213236%
      St. Mary's, AK5213138%
      Source: The St. Mary's, AK 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.