TODAY JUN24
TEMPERATURE56
HUMIDITY86
PRESSURE
WIND COND.347 12
  • 8556Mon30%
  • 7249Tue30%
  • 7654Wed
  • 7252Thu
  • 6651Fri
daynightWeather update from JUDITH PEAK at

Roy Average Weather

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
January-26°F65°F25°F0.3"
February-30°F63°F26°F0.4"
March-11°F72°F33°F0.8"
April0°F79°F40°F1.7"
May16°F86°F50°F3.3"
June28°F91°F58°F3.6"
July36°F99°F69°F1.3"
August37°F99°F65°F1.1"
September27°F94°F56°F1.5"
October1°F83°F43°F1.6"
November-17°F73°F35°F0.7"
December-30°F59°F21°F0.4"

Did you know?

  • The highest monthly average temperature in Roy for July is 69 degrees.
  • The lowest monthly average temperature in Roy for December is 21 degrees.
  • The most monthly precipitation in Roy occurs in June with 3.6 inches.
  • The air quality index in Roy is 51% better than the national average.
  • The pollution index in Roy is 94% better than the national average.

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Compare Roy, MT Weather To Other Cities

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 index243450
Pollution index263,666685,9255,066,862

Roy air quality information

MeasurementTotal
Days measured365
Days with good air quality340
Days with moderate air quality24
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

Roy air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Roy, MT1222452%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Rosendale, MO1224510%
Marion, ND1223530%
Adak, AK1222942%
Los Altos, TX1223824%
Eugenio Saenz, TX1223628%
Roy, MT1222452%
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.