TODAY AUG21
TEMPERATURE41
HUMIDITY100
PRESSURE
WIND COND.17 5
  • 6643Tue20%
  • 7849Wed20%
  • 7948Thu
  • 7744Fri
  • 7646Sat
daynightWeather update from GALENA at

Boulder 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
January9°F33°F20°F0.4"
February12°F37°F23°F0.4"
March20°F44°F31°F0.6"
April26°F52°F38°F1.4"
May34°F62°F47°F2.2"
June41°F71°F55°F2.8"
July46°F84°F65°F1.0"
August43°F80°F61°F1.2"
September36°F71°F52°F1.3"
October28°F54°F39°F1.4"
November19°F42°F30°F0.5"
December7°F29°F17°F0.5"

Did you know?

  • The highest monthly average temperature in Boulder for July is 65 degrees.
  • The lowest monthly average temperature in Boulder for December is 17 degrees.
  • The most monthly precipitation in Boulder occurs in June with 2.8 inches.
  • The air quality index in Boulder is 29% better than the national average.
  • The pollution index in Boulder is 88% better than the national average.

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Compare Boulder, MT Weather To Other Cities

Boulder 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.
IndexBoulderMontanaNational
Air quality index353450
Pollution index568,053685,9255,066,862

Boulder air quality information

MeasurementTotal
Days measured365
Days with good air quality315
Days with moderate air quality50
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Boulder air quality information

PollutantTotal
Arsenic0.000%
Benzene0.010%
Carbon Tetrachloride0.002%
Lead0.003%
Mercury0.000%

Average monthly Boulder temperature with heat index

Boulder monthly precipitation with daily maximum

Boulder monthly snow depth with daily maximum

Boulder monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Elkhorn, MT183530%
Jefferson City, MT6863530%
Basin, MT2273530%
Clancy, MT1,6123530%
Boulder, MT1,1443530%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Highlands, NC1,1442746%
Sperry, OK1,144484%
Brookneal, VA1,144275450%
Stryker, OH1,1443824%
Laurel, NE1,1444118%
Boulder, MT1,1443530%
Source: The Boulder, 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.