TODAY JUN02
TEMPERATURE81
HUMIDITY27
PRESSURE30.05
WIND COND.350 10.3
  • 9056Tue
  • 9057Wed
  • 9057Thu
  • 9261Fri
  • 9056Sat
daynightWeather update from Vance Brand Airport at
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Longmont 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 Longmont for July is 75 degrees.
  • The lowest monthly average temperature in Longmont for December is 30 degrees.
  • The most monthly precipitation in Longmont occurs in November with 2.6 inches.
  • The air quality index in Longmont is 16% better than the national average.
  • The pollution index in Longmont is 74% better than the national average.

Compare Longmont, CO Weather To Other Cities

      vs

      Longmont 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.
      IndexLongmontColoradoNational
      Air quality index423850
      Pollution index1,333,3802,034,6195,066,862

      Longmont 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

      Longmont air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.020%
      Carbon Tetrachloride0.001%
      Lead0.010%
      Mercury0.000%

      Average monthly Longmont temperature with heat index

      Longmont monthly precipitation with daily maximum

      Longmont monthly snow depth with daily maximum

      Longmont monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Mead, CO4,1814118%
      Milliken, CO6,1574118%
      Johnstown, CO14,3794118%
      Platteville, CO2,6284118%
      Dacono, CO4,6234216%
      Longmont, CO90,7194216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Plantation, FL90,8784118%
      Santa Barbara, CA90,9224412%
      Germantown, MD90,494492%
      Sunrise, FL91,1774118%
      Redding, CA91,3203824%
      Longmont, CO90,7194216%
      Source: The Longmont, 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.