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Key findings

  • The highest monthly average temperature in Johnstonville for July is 74 degrees
  • The lowest monthly average temperature in Johnstonville for December is 30 degrees
  • The most monthly precipitation in Johnstonville occurs in January with 0 inches
  • The air quality index in Johnstonville is 8% better than the national average
  • The pollution index in Johnstonville is 64% better than the national average

Compare Johnstonville, CA Weather

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      Johnstonville 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
      January19°F47°F31°Fn/a
      February25°F51°F37°Fn/a
      March30°F58°F43°Fn/a
      April31°F63°F47°Fn/a
      May40°F70°F55°Fn/a
      June48°F80°F65°Fn/a
      July56°F90°F74°Fn/a
      August51°F86°F70°Fn/a
      September47°F79°F63°Fn/a
      October34°F68°F50°Fn/a
      November28°F55°F40°Fn/a
      December19°F44°F30°Fn/a

      Johnstonville 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.
      IndexJohnstonvilleCaliforniaNational
      Air quality index465550
      Pollution index1,799,83018,106,7265,066,862

      Johnstonville air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality244
      Days with moderate air quality121
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Johnstonville air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.004%

      Average monthly Johnstonville temperature with heat index

      Johnstonville monthly precipitation with daily maximum

      Johnstonville monthly snow depth with daily maximum

      Johnstonville monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Janesville, CA1,283468%
      Litchfield, CA143468%
      Susanville, CA15,555468%
      Johnstonville, CA1,183468%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Gilbert, IA1,1833726%
      Dover Beaches South, NJ1,1834118%
      Newburg, WI1,1834412%
      Hart, TX1,1832550%
      Mendon, UT1,1834412%
      Johnstonville, CA1,183468%
      Source: The Johnstonville, 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.