TODAY APR13
TEMPERATURE60
HUMIDITY77
PRESSURE
WIND COND.313 4.8
  • 6347Wed
  • 6748Thu
  • 7453Fri
  • 7957Sat
  • 8559Sun
daynightWeather update from SANTA FE DAM at

Key findings

  • The highest monthly average temperature in Altadena for August is 75.3 degrees
  • The lowest monthly average temperature in Altadena for December is 54.9 degrees
  • The most monthly precipitation in Altadena occurs in January with 3.3 inches
  • The air quality index in Altadena is 45% worse than the national average
  • The pollution index in Altadena is 2653% worse than the national average

Compare Altadena, CA Weather

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      Altadena 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"

      Altadena 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.
      IndexAltadenaCaliforniaNational
      Air quality index725550
      Pollution index139,490,00018,106,7265,066,862

      Altadena 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

      Altadena air quality information

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

      Average monthly Altadena temperature with heat index

      Altadena monthly precipitation with daily maximum

      Altadena monthly snow depth with daily maximum

      Altadena monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Baldwin Park, CA76,5117244%
      Hacienda Heights, CA54,0337244%
      South San Jose Hills, CA19,9147244%
      West Puente Valley, CA24,4767244%
      La Crescenta-Montrose, CA19,8247244%
      Altadena, CA45,0017244%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Littleton, CO45,0725816%
      Cleveland Heights, OH45,16050= 100
      West Seneca, NY45,1973922%
      Altoona, PA45,2094118%
      Titusville, FL44,7463726%
      Altadena, CA45,0017244%
      Source: The Altadena, 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.