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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"

Did you know?

  • The highest monthly average temperature in Fullerton for August is 75 degrees.
  • The lowest monthly average temperature in Fullerton for December is 56 degrees.
  • The most monthly precipitation in Fullerton occurs in December with 2.5 inches.
  • The air quality index in Fullerton is 48% worse than the national average.
  • The pollution index in Fullerton is 83% better than the national average.

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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 index745550
Pollution index858,65218,106,7265,066,862

Fullerton air quality information

MeasurementTotal
Days measured365
Days with good air quality25
Days with moderate air quality260
Days w/ poor A.Q. for sensitive groups76
Days with unhealthy air quality4

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.
Bell, CA35,9277448%
Buena Park, CA82,7717448%
Cypress, CA48,9787448%
East Whittier, CA10,4357448%
Hacienda Heights, CA54,0337448%
Fullerton, CA139,4917448%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Orange, CA139,9198570%
Killeen, TX138,7453628%
Pasadena, CA140,2687448%
McAllen, TX138,4753628%
Dayton, OH141,143484%
Fullerton, CA139,4917448%
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.