TODAY NOV25
TEMPERATURE37
HUMIDITY78
PRESSURE102030
WIND COND.70 13
  • 4624Mon
  • 5029Tue40%60%
  • 3815Wed60%40%
  • 3814
  • 4117Fri
daynightWeather update from Vance Brand Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Niwot for July is 74.7 degrees
  • The lowest monthly average temperature in Niwot for December is 29.7 degrees
  • The most monthly precipitation in Niwot occurs in November with 2.6 inches
  • The air quality index in Niwot is 12% worse than the national average
  • The pollution index in Niwot is 57% better than the national average

Compare Niwot, CO Weather

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      Niwot 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"

      Niwot 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.
      IndexNiwotColoradoNational
      Air quality index473842
      Pollution index1,163,3002,068,3422,726,193

      Niwot 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%
      Benzene0.010%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.000%

      Average monthly Niwot temperature with heat index

      Niwot monthly precipitation with daily maximum

      Niwot monthly snow depth with daily maximum

      Niwot monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Mead, CO4,9784510.0%
      Lafayette, CO27,952476.0%
      Lazy Acres, CO1,071476.0%
      Bark Ranch, CO107476.0%
      Jamestown, CO250476.0%
      Niwot, CO4,085476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Reedsport, OR4,0851962.0%
      Nokomis, FL4,0843824.0%
      Camdenton, MO4,0843922.0%
      Rose Hill, KS4,0864020.0%
      Central Kootenay F, BC4,086n/a 
      Niwot, CO4,085476.0%
      Source: The Niwot, 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.