TODAY OCT20
TEMPERATURE42
HUMIDITY100
PRESSURE30.24
WIND COND.
  • 6239Sat
  • 6339Sun
  • 6342Mon
  • 6043Tue
  • 6045Wed
daynightWeather update from Tacoma / McChord Air Force Base at
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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"

Did you know?

  • The highest monthly average temperature in Roy for July is 65 degrees.
  • The lowest monthly average temperature in Roy for December is 38 degrees.
  • The most monthly precipitation in Roy occurs in January with 9 inches.
  • The air quality index in Roy is 37% better than the national average.
  • The pollution index in Roy is 36% worse than the national average.

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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 index313650
Pollution index6,915,9508,596,9895,066,862

Roy air quality information

MeasurementTotal
Days measured364
Days with good air quality291
Days with moderate air quality70
Days w/ poor A.Q. for sensitive groups3
Days with unhealthy air quality

Roy air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Tenino, WA1,7442452%
Alder, WA342452%
Clear Lake, WA1,0563138%
Elk Plain, WA13,8353138%
Kapowsin, WA2423138%
Roy, WA6893138%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Green Valley, IL689484%
Caroleen, NC6893628%
Camden, NC6893922%
Higginson, AR689476%
Bird-in-Hand, PA6894510%
Roy, WA6893138%
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.