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Key findings

  • The highest monthly average temperature in Fairfax for July is 64.6 degrees
  • The lowest monthly average temperature in Fairfax for December is 46.6 degrees
  • The most monthly precipitation in Fairfax occurs in January with 3.8 inches
  • The air quality index in Fairfax is 20% better than the national average
  • The pollution index in Fairfax is 62% worse than the national average

Compare Fairfax, CA Weather

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      Fairfax 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
      January36°F58°F47°F3.8"
      February39°F62°F50°F3.4"
      March41°F66°F52°F3.0"
      April42°F69°F55°F1.6"
      May46°F74°F59°F0.5"
      June50°F80°F64°F0.3"
      July53°F81°F65°F0.0"
      August53°F80°F64°F0.0"
      September49°F82°F64°F0.1"
      October45°F76°F59°F1.3"
      November40°F66°F52°F1.8"
      December36°F58°F47°F3.8"

      Fairfax 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.
      IndexFairfaxCaliforniaNational
      Air quality index405550
      Pollution index8,232,36018,106,7265,066,862

      Fairfax air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality290
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Fairfax air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.060%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.010%

      Average monthly Fairfax temperature with heat index

      Fairfax monthly precipitation with daily maximum

      Fairfax monthly snow depth with daily maximum

      Fairfax monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Point Reyes Station, CA5743432%
      San Francisco, CA850,2824020%
      Corte Madera, CA9,6944020%
      Mill Valley, CA14,3184020%
      Strawberry, CA5,6894020%
      Fairfax, CA7,5984020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Yreka, CA7,5983628%
      Selah, WA7,5993824%
      Rockton, IL7,5964216%
      Sanger, TX7,595512%
      Holly Springs, MS7,5914510%
      Fairfax, CA7,5984020%
      Source: The Fairfax, 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.