TODAY OCT15
TEMPERATURE80
HUMIDITY5
PRESSURE
WIND COND.40 5
  • 8055Tue
  • 7957Wed
  • 8057Thu
  • 8458Fri
  • 8459Sat
daynightWeather update from SANTA FE DAM at
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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"

Did you know?

  • The highest monthly average temperature in Altadena for August is 75 degrees.
  • The lowest monthly average temperature in Altadena for December is 55 degrees.
  • The most monthly precipitation in Altadena occurs in January with 3.3 inches.
  • The air quality index in Altadena is 48% worse than the national average.
  • The pollution index in Altadena is 2652% worse than the national average.

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Compare Altadena, CA Weather To Other Cities

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 index745550
Pollution index139,490,00018,106,7265,066,862

Altadena 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

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.
Arcadia, CA57,7557448%
Bell, CA35,9277448%
Citrus, CA11,7807448%
Duarte, CA21,7927448%
El Monte, CA115,6657448%
Altadena, CA45,0017448%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Littleton, CO45,072548%
Cleveland Heights, OH45,1605510%
West Seneca, NY45,1974118%
Altoona, PA45,2094510%
Titusville, FL44,7463530%
Altadena, CA45,0017448%
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.