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Key findings

  • The highest monthly average temperature in Herron Island for August is 64.7 degrees
  • The lowest monthly average temperature in Herron Island for December is 40.5 degrees
  • The most monthly precipitation in Herron Island occurs in November with 6.8 inches
  • The air quality index in Herron Island is 58% better than the national average
  • The pollution index in Herron Island is 32% worse than the national average

Compare Herron Island, WA Weather

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      Herron Island 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
      January36°F46°F41°F6.0"
      February38°F49°F43°F4.2"
      March39°F53°F45°F5.8"
      April42°F58°F49°F3.1"
      May47°F66°F55°F2.4"
      June51°F71°F59°F1.3"
      July55°F77°F64°F0.6"
      August55°F77°F65°F0.8"
      September52°F71°F60°F1.5"
      October47°F60°F52°F4.5"
      November41°F51°F46°F6.8"
      December36°F45°F40°F5.8"

      Herron Island 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.
      IndexHerron IslandWashingtonNational
      Air quality index213650
      Pollution index6,704,3308,596,9895,066,862

      Herron Island air quality information

      MeasurementTotal
      Days measured361
      Days with good air quality339
      Days with moderate air quality22
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Herron Island air quality information

      PollutantTotal
      Arsenic0.003%
      Benzene0.100%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.003%

      Average monthly Herron Island temperature with heat index

      Herron Island monthly precipitation with daily maximum

      Herron Island monthly snow depth with daily maximum

      Herron Island monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Allyn, WA2,4771864%
      Key Center, WA3,5321864%
      Vaughn, WA5291864%
      Burley, WA1,8351864%
      Purdy, WA1,0691864%
      Herron Island, WA672158%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Colwell, IA671570%
      Brandt, SD674216%
      Herron, MT672158%
      Hartman, CO671570%
      Churchville, VA673628%
      Herron Island, WA672158%
      Source: The Herron Island, WA 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.