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Key findings

  • The highest monthly average temperature in Fountain Valley for August is 72 degrees
  • The lowest monthly average temperature in Fountain Valley for December is 57 degrees
  • The most monthly precipitation in Fountain Valley occurs in December with 2.4 inches
  • The air quality index in Fountain Valley is 45% worse than the national average
  • The pollution index in Fountain Valley is 83% better than the national average

Compare Fountain Valley, CA Weather

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      Fountain Valley 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
      January48°F69°F57°F2.3"
      February49°F69°F58°F1.9"
      March52°F70°F60°F0.9"
      April54°F72°F62°F0.6"
      May59°F73°F65°F0.3"
      June62°F76°F67°F0.0"
      July66°F80°F71°F0.1"
      August66°F82°F72°F0.0"
      September65°F82°F72°F0.2"
      October60°F79°F68°F0.5"
      November54°F75°F63°F0.7"
      December48°F68°F57°F2.4"

      Fountain Valley 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.
      IndexFountain ValleyCaliforniaNational
      Air quality index725550
      Pollution index858,65218,106,7265,066,862

      Fountain Valley air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality66
      Days with moderate air quality208
      Days w/ poor A.Q. for sensitive groups62
      Days with unhealthy air quality28

      Fountain Valley air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.010%
      Carbon Tetrachloride0.000%
      Lead0.020%
      Mercury0.001%

      Average monthly Fountain Valley temperature with heat index

      Fountain Valley monthly precipitation with daily maximum

      Fountain Valley monthly snow depth with daily maximum

      Fountain Valley monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Fullerton, CA139,4917244%
      La Mirada, CA49,1307244%
      Rossmoor, CA10,9337244%
      Garden Grove, CA174,6767244%
      Lynwood, CA71,2337244%
      Fountain Valley, CA56,6707244%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Valdosta, GA56,7173530%
      Oak Lawn, IL56,7745510%
      Taunton, MA56,5044412%
      Santee, CA56,8396428%
      Diamond Bar, CA56,4568978%
      Fountain Valley, CA56,6707244%
      Source: The Fountain Valley, CA 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.