TODAY FEB25
TEMPERATURE27
HUMIDITY93
PRESSURE30.22
WIND COND.340 22.3
  • 3517Thu40%
  • 4121Fri
  • 4019Sat20%20%
  • 3820Sun
  • 5127Mon
daynightWeather update from Broomfield / Jeffco at

Key findings

  • The highest monthly average temperature in Thornton for July is 73 degrees
  • The lowest monthly average temperature in Thornton for December is 30 degrees
  • The most monthly precipitation in Thornton occurs in September with 5.7 inches
  • The air quality index in Thornton is 17% worse than the national average
  • The pollution index in Thornton is 96% better than the national average

Compare Thornton, CO Weather

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      Thornton 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
      January21°F45°F31°F1.8"
      February22°F46°F32°F2.0"
      March30°F58°F42°F2.1"
      April35°F63°F47°F4.0"
      May44°F70°F55°F5.2"
      June54°F84°F68°F4.6"
      July60°F89°F73°F5.7"
      August59°F87°F71°F4.5"
      September51°F79°F63°F5.7"
      October39°F67°F51°F4.1"
      November29°F56°F41°F2.2"
      December19°F44°F30°F2.9"

      Thornton 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.
      IndexThorntonColoradoNational
      Air quality index583850
      Pollution index209,2532,034,6195,066,862

      Thornton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality91
      Days with moderate air quality252
      Days w/ poor A.Q. for sensitive groups20
      Days with unhealthy air quality2

      Thornton air quality information

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

      Average monthly Thornton temperature with heat index

      Thornton monthly precipitation with daily maximum

      Thornton monthly snow depth with daily maximum

      Thornton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Eldorado Springs, CO935476%
      Erie, CO20,801476%
      Louisville, CO19,972476%
      Superior, CO12,928476%
      Gunbarrel, CO9,559476%
      Thornton, CO130,5115816%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      New Haven, CT130,4054118%
      Waco, TX130,6593824%
      Charleston, SC129,8883824%
      Enterprise, NV129,620548%
      Cedar Rapids, IA129,5373922%
      Thornton, CO130,5115816%
      Source: The Thornton, 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.