Roy, MT Weather - Forecast & Monthly Averages

TEMPERATURE	20
HUMIDITY	93
PRESSURE	101220
WIND COND.	120 22.3

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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

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	16°F	37°F	26°F	0.8"
February	18°F	40°F	28°F	1.1"
March	27°F	52°F	39°F	0.8"
April	33°F	60°F	46°F	2.6"
May	38°F	64°F	51°F	3.6"
June	50°F	78°F	65°F	4.5"
July	55°F	86°F	71°F	4.0"
August	53°F	84°F	69°F	1.6"
September	46°F	73°F	60°F	3.4"
October	37°F	62°F	49°F	3.5"
November	24°F	47°F	35°F	1.6"
December	14°F	34°F	24°F	1.1"

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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.
Index	Roy	Montana	National
Air quality index	21	34	42
Pollution index	263,666	834,473	2,726,193

Roy air quality

Measurement	Total
Days measured	362
Days with good air quality	357
Days with moderate air quality	4
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	1

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.005%
Carbon Tetrachloride	0.001%
Lead	0.010%
Mercury	0.000%

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	Population	Air Quality Index	National Avg.
Roy, MT	120	21	58.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Haleburg, AL	120	35	30.0%
Haynes, AR	120	45	10.0%
Pike, CA	120	44	12.0%
Nunez, GA	120	47	6.0%
Makaha Valley, HI	120	30	40.0%
Roy, MT	120	21	58.0%

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.