TODAY FEB26
TEMPERATURE39
HUMIDITY70
PRESSURE30.18
WIND COND.
  • 6637Fri
  • 6337Sat
  • 6738Sun
  • 6839Mon
  • 6538Tue
daynightWeather update from Sacramento Executive Airport at

Key findings

  • The highest monthly average temperature in Thornton for July is 74 degrees
  • The lowest monthly average temperature in Thornton for January is 47 degrees
  • The most monthly precipitation in Thornton occurs in December with 3.8 inches
  • The air quality index in Thornton is 10% better than the national average
  • The pollution index in Thornton is 205% worse than the national average

Compare Thornton, CA Weather

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      Thornton 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
      January38°F58°F47°F3.3"
      February41°F63°F51°F3.1"
      March44°F68°F55°F2.9"
      April47°F74°F59°F1.8"
      May52°F82°F65°F0.5"
      June57°F90°F71°F0.3"
      July59°F95°F74°F0.0"
      August58°F93°F73°F0.0"
      September56°F90°F70°F0.1"
      October50°F79°F63°F1.2"
      November43°F66°F53°F1.6"
      December38°F57°F47°F3.8"

      Thornton 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.
      IndexThorntonCaliforniaNational
      Air quality index455550
      Pollution index15,476,50018,106,7265,066,862

      Thornton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality229
      Days with moderate air quality123
      Days w/ poor A.Q. for sensitive groups12
      Days with unhealthy air quality1

      Thornton air quality information

      PollutantTotal
      Arsenic0.090%
      Benzene0.130%
      Carbon Tetrachloride0.010%
      Lead0.130%
      Mercury0.070%

      Average monthly Thornton temperature with heat index

      Thornton monthly precipitation with daily maximum

      Thornton monthly snow depth with daily maximum

      Thornton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Acampo, CA4664510%
      Galt, CA24,8484510%
      Victor, CA5794510%
      Woodbridge, CA3,8824510%
      Bethel Island, CA2,1994510%
      Thornton, CA9684510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Peru, NE9683138%
      Hankinson, ND9683334%
      Afton, IA9673922%
      Mulga, AL967536%
      Millersburg, IN9673726%
      Thornton, CA9684510%
      Source: The Thornton, 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.