TODAY MAY15
TEMPERATURE60
HUMIDITY76
PRESSURE
WIND COND.138 3.2
  • 6953Sat30%
  • 6554Sun30%
  • 7056Mon
  • 7457Tue
  • 7455Wed
daynightWeather update from SANTA FE DAM at

Key findings

  • The highest monthly average temperature in Charter Oak for August is 77.8 degrees
  • The lowest monthly average temperature in Charter Oak for December is 54.5 degrees
  • The most monthly precipitation in Charter Oak occurs in December with 2.6 inches
  • The air quality index in Charter Oak is 79% worse than the national average
  • The pollution index in Charter Oak is 2653% worse than the national average

Compare Charter Oak, CA Weather

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      Charter Oak 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
      January44°F69°F56°F2.3"
      February45°F70°F57°F2.0"
      March48°F74°F60°F1.2"
      April51°F77°F62°F0.7"
      May55°F81°F66°F0.4"
      June60°F88°F72°F0.0"
      July65°F94°F77°F0.1"
      August65°F95°F78°F0.0"
      September64°F93°F76°F0.2"
      October57°F84°F69°F0.4"
      November49°F77°F62°F0.6"
      December43°F68°F55°F2.6"

      Charter Oak 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.
      IndexCharter OakCaliforniaNational
      Air quality index895550
      Pollution index139,490,00018,106,7265,066,862

      Charter Oak air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality42
      Days with moderate air quality178
      Days w/ poor A.Q. for sensitive groups79
      Days with unhealthy air quality58

      Charter Oak air quality information

      PollutantTotal
      Arsenic0.200%
      Benzene0.950%
      Carbon Tetrachloride0.080%
      Lead1.320%
      Mercury0.440%

      Average monthly Charter Oak temperature with heat index

      Charter Oak monthly precipitation with daily maximum

      Charter Oak monthly snow depth with daily maximum

      Charter Oak monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      San Pasqual, CA2,0177244%
      South San Gabriel, CA8,7257244%
      Bradbury, CA9547244%
      Industry, CA2667244%
      South San Jose Hills, CA19,9147244%
      Charter Oak, CA9,4018978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Dunn Loring, VA9,397476%
      Pleasant Hill, IA9,4063922%
      Warren, PA9,407982%
      Jeannette, PA9,3955612%
      Linganore, MD9,3954020%
      Charter Oak, CA9,4018978%
      Source: The Charter Oak, 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.