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Key findings

  • The highest monthly average temperature in Delta for August is 63 degrees
  • The lowest monthly average temperature in Delta for December is 39 degrees
  • The most monthly precipitation in Delta occurs in November with 5.7 inches
  • The air quality index in Delta is 10% better than the national average
  • The pollution index in Delta is 211% worse than the national average

Compare Everett, WA Weather

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      Delta 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
      January36°F46°F41°F3.8"
      February37°F49°F42°F2.7"
      March39°F52°F45°F4.4"
      April42°F57°F48°F2.8"
      May47°F64°F54°F2.2"
      June51°F68°F58°F1.8"
      July55°F74°F63°F0.7"
      August56°F75°F63°F0.9"
      September53°F69°F59°F2.0"
      October47°F59°F52°F3.6"
      November40°F51°F45°F5.7"
      December35°F44°F39°F4.9"

      Delta 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.
      IndexDeltaEverettWashington
      Air quality index454536
      Pollution index15,778,90043,367,4008,596,989

      Delta air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality236
      Days with moderate air quality127
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Delta air quality information

      PollutantTotal
      Arsenic0.020%
      Benzene0.790%
      Carbon Tetrachloride0.120%
      Lead0.210%
      Mercury0.180%

      Average monthly Delta temperature with heat index

      Delta monthly precipitation with daily maximum

      Delta monthly snow depth with daily maximum

      Delta monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Cavalero, WA5,1192452%
      Granite Falls, WA3,4582452%
      Silvana, WA872452%
      Lake Bosworth, WA7582452%
      Lochsloy, WA2,7892452%
      Everett, WA106,5804510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Palm Bay, FL106,5733628%
      Highlands Ranch, CO106,5965816%
      Norwalk, CA106,3607244%
      Pearland, TX106,238524%
      North Charleston, SC106,1133824%
      Everett, WA106,5804510%
      Source: The Delta, Everett, WA 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.