TODAY SEP25
TEMPERATURE63
HUMIDITY27
PRESSURE30.23
WIND COND.80 8.1
  • 7248Wed
  • 8146Thu
  • 6645Fri
  • 8151Sat
  • 8252Sun
daynightWeather update from Broomfield / Jeffco at
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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"

Did you know?

  • 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 8% worse than the national average.
  • The pollution index in Thornton is 95% better than the national average.

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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 index543850
Pollution index209,2532,034,6195,066,862

Thornton air quality information

MeasurementTotal
Days measured365
Days with good air quality153
Days with moderate air quality189
Days w/ poor A.Q. for sensitive groups23
Days with unhealthy air quality

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.
Dacono, CO4,6234216%
Lafayette, CO27,0534216%
Broomfield, CO62,4494216%
Eldorado Springs, CO9354216%
Gunbarrel, CO9,5594216%
Thornton, CO130,511548%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
New Haven, CT130,405492%
Waco, TX130,6593922%
Charleston, SC129,8883628%
Enterprise, NV129,620548%
Cedar Rapids, IA129,5374216%
Thornton, CO130,511548%
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.