TODAY MAY16
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 7055Mon
  • 7354Tue
  • 7454Wed
  • 7052Thu
  • 7251Fri
daynightWeather update from WHITTIER HILLS at

Key findings

  • The highest monthly average temperature in Diamond Bar for August is 76.6 degrees
  • The lowest monthly average temperature in Diamond Bar for December is 53.1 degrees
  • The most monthly precipitation in Diamond Bar occurs in December with 2 inches
  • The air quality index in Diamond Bar is 79% worse than the national average
  • The pollution index in Diamond Bar is 83% better than the national average

Compare Diamond Bar, CA Weather

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      Diamond Bar 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
      January40°F70°F54°F1.6"
      February41°F71°F55°F1.4"
      March44°F75°F58°F0.8"
      April47°F78°F61°F0.4"
      May52°F82°F65°F0.3"
      June57°F89°F71°F0.0"
      July62°F94°F76°F0.1"
      August61°F96°F77°F0.0"
      September59°F94°F74°F0.1"
      October52°F86°F67°F0.3"
      November44°F78°F60°F0.4"
      December39°F69°F53°F2.0"

      Diamond Bar 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.
      IndexDiamond BarCaliforniaNational
      Air quality index895550
      Pollution index858,65218,106,7265,066,862

      Diamond Bar air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality42
      Days with moderate air quality178
      Days w/ poor A.Q. for sensitive groups79
      Days with unhealthy air quality58

      Diamond Bar air quality information

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

      Average monthly Diamond Bar temperature with heat index

      Diamond Bar monthly precipitation with daily maximum

      Diamond Bar monthly snow depth with daily maximum

      Diamond Bar monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Hawaiian Gardens, CA14,4687244%
      La Palma, CA15,8347244%
      South Whittier, CA59,3137244%
      Monrovia, CA37,0907244%
      East Pasadena, CA6,1597244%
      Diamond Bar, CA56,4568978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      New Brunswick, NJ56,4274118%
      Berwyn, IL56,4145510%
      Taunton, MA56,5044412%
      Dearborn Heights, MI56,3295612%
      Lehi, UT56,314468%
      Diamond Bar, CA56,4568978%
      Source: The Diamond Bar, 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.