TODAY MAR05
TEMPERATURE51
HUMIDITY74
PRESSURE30.21
WIND COND.30 5.4
  • 7746Fri
  • 6746Sat
  • 6647Sun
  • 6144Mon
  • 6043Tue
daynightWeather update from Ontario, Ontario International Airport at

Key findings

  • The highest monthly average temperature in Montclair for August is 78 degrees
  • The lowest monthly average temperature in Montclair for December is 55 degrees
  • The most monthly precipitation in Montclair occurs in December with 2.6 inches
  • The air quality index in Montclair is 79% worse than the national average
  • The pollution index in Montclair is 350% worse than the national average

Compare Montclair, CA Weather

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      Montclair 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
      January44°F69°F56°F2.3"
      February45°F70°F57°F2.0"
      March48°F74°F60°F1.2"
      April51°F77°F62°F0.7"
      May55°F81°F66°F0.4"
      June60°F88°F72°F0.0"
      July65°F94°F77°F0.1"
      August65°F95°F78°F0.0"
      September64°F93°F76°F0.2"
      October57°F84°F69°F0.4"
      November49°F77°F62°F0.6"
      December43°F68°F55°F2.6"

      Montclair 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.
      IndexMontclairCaliforniaNational
      Air quality index895550
      Pollution index22,790,90018,106,7265,066,862

      Montclair 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

      Montclair air quality information

      PollutantTotal
      Arsenic0.060%
      Benzene0.190%
      Carbon Tetrachloride0.010%
      Lead0.220%
      Mercury0.230%

      Average monthly Montclair temperature with heat index

      Montclair monthly precipitation with daily maximum

      Montclair monthly snow depth with daily maximum

      Montclair monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      South San Jose Hills, CA19,9147244%
      West Covina, CA107,6347244%
      La Habra, CA61,6607244%
      Azusa, CA48,4987244%
      Industry, CA2667244%
      Montclair, CA38,2948978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Carpentersville, IL38,2755510%
      Friendswood, TX38,272524%
      Hanover Park, IL38,3315510%
      Chelsea, MA38,2444314%
      Florence, SC38,2214020%
      Montclair, CA38,2948978%
      Source: The Montclair, 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.