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Key findings

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

Compare San Geronimo, CA Weather

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      San Geronimo 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"

      San Geronimo 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.
      IndexSan GeronimoCaliforniaNational
      Air quality index405550
      Pollution index8,232,36018,106,7265,066,862

      San Geronimo 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

      San Geronimo air quality information

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

      Average monthly San Geronimo temperature with heat index

      San Geronimo monthly precipitation with daily maximum

      San Geronimo monthly snow depth with daily maximum

      San Geronimo monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Point Reyes Station, CA5743432%
      Marin City, CA3,1154020%
      Stinson Beach, CA6034020%
      Tiburon, CA9,1704020%
      Nicasio, CA1134020%
      San Geronimo, CA5974020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Bryantown, MD597476%
      Canaseraga, NY5973530%
      Bend, CA5974118%
      Sheridan, MI5973824%
      Ghent, WV597295490%
      San Geronimo, CA5974020%
      Source: The San Geronimo, 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.