TODAY NOV07
TEMPERATURE55
HUMIDITY59
PRESSURE102340
WIND COND.
  • 6244Fri30%
  • 5542Sat80%70%
  • 5745Sun80%
  • 5343
  • 5242Tue
daynightWeather update from Tacoma / McChord Air Force Base at
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Weather Quick Facts

  • The highest monthly average temperature in Roy for July is 65.1 degrees
  • The lowest monthly average temperature in Roy for December is 37.7 degrees
  • The most monthly precipitation in Roy occurs in January with 9 inches
  • The air quality index in Roy is 29% better than the national average
  • The pollution index in Roy is 154% worse than the national average

Compare Roy, WA Weather

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      Roy 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
      January34°F46°F39°F9.0"
      February34°F49°F40°F4.0"
      March36°F52°F43°F4.2"
      April38°F58°F47°F2.9"
      May43°F65°F53°F4.4"
      June49°F70°F59°F3.3"
      July54°F79°F65°F1.9"
      August53°F77°F64°F3.2"
      September49°F72°F59°F3.7"
      October42°F60°F50°F5.2"
      November39°F51°F44°F8.1"
      December32°F44°F38°F6.1"

      Roy 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.
      IndexRoyWashingtonNational
      Air quality index303642
      Pollution index6,915,9504,541,8502,726,193

      Roy air quality

      MeasurementTotal
      Days measured365
      Days with good air quality323
      Days with moderate air quality42
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.110%
      Carbon Tetrachloride0.010%
      Lead0.000%
      Mercury0.001%

      Average monthly Roy temperature with heat index

      Roy monthly precipitation with daily maximum

      Roy monthly snow depth with daily maximum

      Roy monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Tenino, WA1,7442060.0%
      Alder, WA1342060.0%
      McChord AFB, WA3,2683040.0%
      Prairie Heights, WA4,8103040.0%
      Eatonville, WA3,0073040.0%
      Roy, WA8143040.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Adair, IA8143922.0%
      Science Hill, KY8144020.0%
      Cleveland, NY8143726.0%
      Poestenkill, NY8143726.0%
      Eastview, TN8142746.0%
      Roy, WA8143040.0%
      Source: The Roy, 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.