TODAY NOV09
TEMPERATURE31
HUMIDITY92
PRESSURE101460
WIND COND.330 20.5
  • 4128Sat60%
  • 5129Sun
  • 5132
  • 5225Tue
  • 5031Wed
daynightWeather update from Denver - Centennial Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Castle Rock for July is 72.9 degrees
  • The lowest monthly average temperature in Castle Rock for December is 30.2 degrees
  • The most monthly precipitation in Castle Rock occurs in July with 2.3 inches
  • The air quality index in Castle Rock is 38% worse than the national average
  • The pollution index in Castle Rock is 59% better than the national average

Compare Castle Rock, CO Weather

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      Castle Rock 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
      January19°F46°F32°F0.5"
      February20°F48°F33°F0.5"
      March28°F58°F42°F0.9"
      April33°F63°F47°F2.0"
      May42°F70°F55°F2.3"
      June53°F85°F68°F2.0"
      July59°F88°F73°F2.3"
      August57°F86°F71°F2.1"
      September49°F79°F63°F1.7"
      October37°F67°F51°F1.3"
      November28°F58°F41°F0.4"
      December18°F45°F30°F0.5"

      Castle Rock 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.
      IndexCastle RockColoradoNational
      Air quality index583842
      Pollution index1,130,1902,068,3422,726,193

      Castle Rock air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.020%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.000%

      Average monthly Castle Rock temperature with heat index

      Castle Rock monthly precipitation with daily maximum

      Castle Rock monthly snow depth with daily maximum

      Castle Rock monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Larkspur, CO2444510.0%
      Perry Park, CO1,8214510.0%
      Ponderosa Park, CO3,5335816.0%
      The Pinery, CO10,0335816.0%
      Columbine, CO25,8925816.0%
      Castle Rock, CO65,1765816.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Jupiter, FL65,1393628.0%
      Bayonne, NJ65,112512.0%
      Medicine Hat, AB65,247n/a 
      Bethesda, MD65,092476.0%
      Sammamish, WA65,2654510.0%
      Castle Rock, CO65,1765816.0%
      Source: The Castle Rock, 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.