TODAY NOV21
TEMPERATURE43
HUMIDITY100
PRESSURE
WIND COND.
  • 5541Fri100%80%
  • 5040Sat90%90%
  • 5140Sun80%
  • 5038Mon
  • 4938Tue
daynightWeather update from CASTLE ROCK at
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Weather Quick Facts

  • The highest monthly average temperature in Castle Rock for August is 65.7 degrees
  • The lowest monthly average temperature in Castle Rock for December is 39.3 degrees
  • The most monthly precipitation in Castle Rock occurs in December with 8.9 inches
  • The air quality index in Castle Rock is 57% better than the national average
  • The pollution index in Castle Rock is 55% worse than the national average

Compare Castle Rock, WA 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
      January35°F47°F40°F8.3"
      February36°F52°F42°F5.4"
      March40°F56°F46°F6.0"
      April41°F62°F50°F4.8"
      May47°F69°F56°F5.7"
      June52°F73°F60°F3.6"
      July55°F80°F65°F2.1"
      August55°F81°F66°F2.8"
      September51°F75°F61°F5.1"
      October46°F63°F53°F6.4"
      November40°F52°F45°F8.2"
      December35°F45°F39°F8.9"

      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 RockWashingtonNational
      Air quality index183642
      Pollution index4,215,4104,541,8502,726,193

      Castle Rock air quality

      MeasurementTotal
      Days measured360
      Days with good air quality338
      Days with moderate air quality22
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.005%
      Benzene0.050%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.250%

      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.
      Longview, WA37,9141864.0%
      Vader, WA6961864.0%
      Clatskanie, OR2,1891864.0%
      Longview Heights, WA4,3881864.0%
      West Side Highway, WA5,7351864.0%
      Castle Rock, WA2,9171864.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Heritage Lake, IN2,917548.0%
      Chaffee, MO2,9174412.0%
      Seaside Heights, NJ2,9174118.0%
      University Park, NM2,917512.0%
      Peace River E, BC2,917n/a 
      Castle Rock, WA2,9171864.0%
      Source: The Castle Rock, WA 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.