TODAY NOV08
TEMPERATURE38
HUMIDITY73
PRESSURE102070
WIND COND.260 14.8
  • 5538Fri
  • 5638Sat
  • 5134Sun
  • 5838
  • 4730Tue
daynightWeather update from Roy at
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Weather Quick Facts

  • The highest monthly average temperature in Roy for July is 71 degrees
  • The lowest monthly average temperature in Roy for December is 23.8 degrees
  • The most monthly precipitation in Roy occurs in June with 4.5 inches
  • The air quality index in Roy is 50% better than the national average
  • The pollution index in Roy is 90% better than the national average

Compare Roy, MT 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
      January16°F37°F26°F0.8"
      February18°F40°F28°F1.1"
      March27°F52°F39°F0.8"
      April33°F60°F46°F2.6"
      May38°F64°F51°F3.6"
      June50°F78°F65°F4.5"
      July55°F86°F71°F4.0"
      August53°F84°F69°F1.6"
      September46°F73°F60°F3.4"
      October37°F62°F49°F3.5"
      November24°F47°F35°F1.6"
      December14°F34°F24°F1.1"

      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.
      IndexRoyMontanaNational
      Air quality index213442
      Pollution index263,666834,4732,726,193

      Roy air quality

      MeasurementTotal
      Days measured362
      Days with good air quality357
      Days with moderate air quality4
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.005%
      Carbon Tetrachloride0.001%
      Lead0.010%
      Mercury0.000%

      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.
      Roy, MT1202158.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Haleburg, AL1203530.0%
      Haynes, AR1204510.0%
      Pike, CA1204412.0%
      Nunez, GA120476.0%
      Makaha Valley, HI1203040.0%
      Roy, MT1202158.0%
      Source: The Roy, MT 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.