TODAY APR19
TEMPERATURE65
HUMIDITY24
PRESSURE102100
WIND COND.150 18.4
  • 6843Sat90%
  • 5540Sun70%
  • 5843Mon
  • 6345Tue
  • 5844Wed
daynightWeather update from Arlington Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Lake Ketchum for August is 63.3 degrees
  • The lowest monthly average temperature in Lake Ketchum for December is 37.6 degrees
  • The most monthly precipitation in Lake Ketchum occurs in November with 4 inches
  • The air quality index in Lake Ketchum is 43% better than the national average
  • The pollution index in Lake Ketchum is 479% worse than the national average

Compare Lake Ketchum, WA Weather

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      Lake Ketchum 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
      January33°F46°F39°F3.0"
      February34°F50°F41°F1.7"
      March37°F54°F45°F3.4"
      April40°F59°F48°F2.0"
      May45°F65°F54°F2.4"
      June49°F70°F59°F1.9"
      July52°F77°F63°F1.3"
      August52°F78°F63°F1.4"
      September49°F71°F58°F2.4"
      October43°F60°F50°F3.4"
      November37°F52°F44°F4.0"
      December32°F44°F38°F3.1"

      Lake Ketchum 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.
      IndexLake KetchumWashingtonNational
      Air quality index243642
      Pollution index15,778,9004,541,8502,726,193

      Lake Ketchum air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality361
      Days with moderate air quality4
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Lake Ketchum air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.270%
      Carbon Tetrachloride0.040%
      Lead0.160%
      Mercury0.003%

      Average monthly Lake Ketchum temperature with heat index

      Lake Ketchum monthly precipitation with daily maximum

      Lake Ketchum monthly snow depth with daily maximum

      Lake Ketchum monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Oak Harbor, WA23,3582452.0%
      Camano, WA17,0732452.0%
      Lake Goodwin, WA4,6132452.0%
      Big Lake, WA2,2512452.0%
      Conway, WA402452.0%
      Lake Ketchum, WA1,2782452.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Berry Creek, CA1,278468.0%
      Grabill, IN1,2784510.0%
      Musquash, NB1,278n/a 
      Litchfield, CT1,2793726.0%
      St. Leo, FL1,2773628.0%
      Lake Ketchum, WA1,2782452.0%
      Source: The Lake Ketchum, 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.