TODAY SEP21
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 8356Sat
  • 8555Sun
  • 7346Mon
  • 6544Tue
  • 7143Wed
daynightWeather update from Boulder Municipal Airport at
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Boulder 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
January18°F48°F32°F1.2"
February21°F50°F34°F1.5"
March30°F62°F44°F1.6"
April36°F66°F49°F0.2"
May43°F73°F57°F2.4"
June54°F89°F71°F1.1"
July59°F92°F75°F2.1"
August56°F90°F72°F1.1"
September49°F82°F64°F0.2"
October38°F69°F52°F2.1"
November28°F58°F41°F2.6"
December17°F46°F30°F0.7"

Did you know?

  • The highest monthly average temperature in Boulder for July is 75 degrees.
  • The lowest monthly average temperature in Boulder for December is 30 degrees.
  • The most monthly precipitation in Boulder occurs in November with 2.6 inches.
  • The air quality index in Boulder is 15% better than the national average.
  • The pollution index in Boulder is 79% better than the national average.

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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.
IndexBoulderColoradoNational
Air quality index423850
Pollution index1,028,8502,034,6195,066,862

Boulder air quality information

MeasurementTotal
Days measured363
Days with good air quality296
Days with moderate air quality63
Days w/ poor A.Q. for sensitive groups4
Days with unhealthy air quality

Boulder air quality information

PollutantTotal
Arsenic0.001%
Benzene0.020%
Carbon Tetrachloride0.001%
Lead0.240%
Mercury0.010%

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.
Mead, CO4,1814118%
Bonanza Mountain Estates, CO1674216%
Crisman, CO4024216%
Jamestown, CO2194216%
Longmont, CO90,7194216%
Boulder, CO105,4204216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Daly City, CA105,5434314%
Wichita Falls, TX105,0132648%
West Palm Beach, FL104,9782942%
Green Bay, WI104,9514020%
Broken Arrow, OK104,869484%
Boulder, CO105,4204216%
Source: The Boulder, CO 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.