TODAY MAY18
TEMPERATURE66
HUMIDITY70
PRESSURE29.99
WIND COND.
  • 7659Wed
  • 7356Thu
  • 7054Fri
  • 7056Sat
  • 7658Sun
daynightWeather update from Fullerton, Fullerton Municipal Airport at

Key findings

  • The highest monthly average temperature in Fullerton for August is 75 degrees
  • The lowest monthly average temperature in Fullerton for December is 56.3 degrees
  • The most monthly precipitation in Fullerton occurs in December with 2.5 inches
  • The air quality index in Fullerton is 45% worse than the national average
  • The pollution index in Fullerton is 83% better than the national average

Compare Fullerton, CA Weather

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      Fullerton 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
      January46°F72°F57°F2.3"
      February48°F72°F58°F1.7"
      March51°F75°F61°F1.0"
      April54°F76°F64°F0.5"
      May58°F78°F66°F0.3"
      June62°F81°F70°F0.0"
      July66°F86°F74°F0.1"
      August66°F88°F75°F0.0"
      September65°F88°F74°F0.2"
      October59°F83°F69°F0.4"
      November52°F77°F63°F0.6"
      December45°F70°F56°F2.5"

      Fullerton 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.
      IndexFullertonCaliforniaNational
      Air quality index725550
      Pollution index858,65218,106,7265,066,862

      Fullerton 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

      Fullerton air quality information

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

      Average monthly Fullerton temperature with heat index

      Fullerton monthly precipitation with daily maximum

      Fullerton monthly snow depth with daily maximum

      Fullerton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Hacienda Heights, CA54,0337244%
      South San Jose Hills, CA19,9147244%
      West Covina, CA107,6347244%
      Bell Gardens, CA42,8057244%
      Downey, CA113,2237244%
      Fullerton, CA139,4917244%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Orange, CA139,9198978%
      Killeen, TX138,7454216%
      Pasadena, CA140,2687244%
      McAllen, TX138,4754216%
      Dayton, OH141,143476%
      Fullerton, CA139,4917244%
      Source: The Fullerton, 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.