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Key findings

  • The highest monthly average temperature in Pasadena for August is 75.3 degrees
  • The lowest monthly average temperature in Pasadena for December is 54.9 degrees
  • The most monthly precipitation in Pasadena occurs in January with 3.3 inches
  • The air quality index in Pasadena is 45% worse than the national average
  • The pollution index in Pasadena is 5017% worse than the national average

Compare Pasadena, CA Weather

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      Pasadena 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
      January45°F69°F56°F3.3"
      February46°F70°F57°F2.5"
      March49°F73°F60°F2.0"
      April52°F75°F62°F0.6"
      May56°F78°F65°F0.2"
      June60°F83°F70°F0.0"
      July65°F89°F75°F0.0"
      August65°F90°F75°F0.0"
      September63°F89°F74°F0.2"
      October57°F82°F68°F0.5"
      November50°F76°F62°F0.6"
      December44°F68°F55°F2.1"

      Pasadena 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.
      IndexPasadenaCaliforniaNational
      Air quality index725550
      Pollution index139,490,00010,473,1902,726,193

      Pasadena 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

      Pasadena air quality information

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

      Average monthly Pasadena temperature with heat index

      Pasadena monthly precipitation with daily maximum

      Pasadena monthly snow depth with daily maximum

      Pasadena monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Azusa, CA48,4987244.0%
      La Puente, CA40,3847244.0%
      Vincent, CA16,4167244.0%
      Burbank CDP, CA4,9847244.0%
      Los Angeles, CA3,918,8727244.0%
      Pasadena, CA140,2687244.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Cambridge, ON140,221n/a 
      Orange, CA139,9198978.0%
      St. Catharines, ON140,913n/a 
      Fullerton, CA139,4917244.0%
      Dayton, OH141,143476.0%
      Pasadena, CA140,2687244.0%
      Source: The Pasadena, 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.