TODAY MAR19
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 3117Tue20%
  • 3118Wed
  • 3221Thu
  • 3121Fri
  • 3422Sat
daynightWeather update from Copper Mountain - Red Cliff Pass at
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Weather Quick Facts

  • The highest monthly average temperature in Keystone for July is 55.7 degrees
  • The lowest monthly average temperature in Keystone for January is 16.9 degrees
  • The most monthly precipitation in Keystone occurs in August with 2 inches
  • The air quality index in Keystone is 12% worse than the national average
  • The pollution index in Keystone is 73% better than the national average

Compare Keystone, CO Weather

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      Keystone 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
      January5°F30°F17°F1.4"
      February7°F31°F18°F1.1"
      March13°F39°F26°F1.3"
      April19°F44°F31°F1.7"
      May27°F55°F40°F1.4"
      June34°F69°F53°F0.5"
      July40°F72°F56°F1.9"
      August38°F69°F53°F2.0"
      September32°F63°F47°F1.4"
      October24°F51°F37°F1.1"
      November15°F41°F27°F1.0"
      December6°F30°F18°F1.4"

      Keystone 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.
      IndexKeystoneColoradoNational
      Air quality index473842
      Pollution index736,4312,068,3422,726,193

      Keystone air quality information

      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

      Keystone air quality information

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

      Average monthly Keystone temperature with heat index

      Keystone monthly precipitation with daily maximum

      Keystone monthly snow depth with daily maximum

      Keystone monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Breckenridge, CO5,054476.0%
      Montezuma, CO151476.0%
      Silver Plume, CO175476.0%
      Copper Mountain, CO455476.0%
      Silverthorne, CO4,610476.0%
      Keystone, CO799476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Upper Bear Creek, CO799476.0%
      Crossville, IL7994510.0%
      Truesdale, MO799548.0%
      Lost City, OK7993628.0%
      Brownstown borough, PA7994510.0%
      Keystone, CO799476.0%
      Source: The Keystone, 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.