TODAY NOV21
TEMPERATURE41
HUMIDITY30
PRESSURE102370
WIND COND.
  • 6438Fri
  • 6738Sat
  • 5326Sun20%
  • 4528Mon
  • 5028Tue
daynightWeather update from Boulder Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Boulder for July is 74.7 degrees
  • The lowest monthly average temperature in Boulder for December is 29.7 degrees
  • The most monthly precipitation in Boulder occurs in November with 2.6 inches
  • The air quality index in Boulder is 12% worse than the national average
  • The pollution index in Boulder is 62% better than the national average

Compare Boulder, CO Weather

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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"

      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 index473842
      Pollution index1,028,8502,068,3422,726,193

      Boulder air quality

      MeasurementTotal
      Days measured365
      Days with good air quality227
      Days with moderate air quality133
      Days w/ poor A.Q. for sensitive groups5
      Days with unhealthy air quality0

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Mead, CO4,9784510.0%
      Valmont, CO98476.0%
      Coal Creek town, CO308476.0%
      Eldorado Springs, CO325476.0%
      Bark Ranch, CO107476.0%
      Boulder, CO108,777476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Broken Arrow, OK108,8754510.0%
      San Buenaventura (Ventura), CA108,467468.0%
      Inglewood, CA109,3097244.0%
      Sandy Springs, GA108,180524.0%
      Hillsboro, OR108,0263824.0%
      Boulder, CO108,777476.0%
      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.