TODAY APR30
TEMPERATURE55
HUMIDITY45
PRESSURE101520
WIND COND.360 18.4
  • 5533Tue20%20%
  • 6036Wed20%
  • 6239Thu
  • 6743Fri
  • 6845Sat20%40%
daynightWeather update from Ontario Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Annex for July is 78.8 degrees
  • The lowest monthly average temperature in Annex for January is 27.4 degrees
  • The most monthly precipitation in Annex occurs in December with 1.8 inches
  • The air quality index in Annex is 14% better than the national average
  • The pollution index in Annex is 40% better than the national average

Compare Annex, OR Weather

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      Annex 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
      January20°F36°F27°F1.1"
      February26°F47°F36°F0.7"
      March33°F58°F44°F1.2"
      April37°F66°F51°F0.7"
      May45°F76°F60°F1.2"
      June53°F86°F69°F0.7"
      July61°F97°F79°F0.1"
      August57°F93°F75°F0.2"
      September48°F83°F64°F0.4"
      October38°F67°F51°F0.8"
      November29°F50°F38°F1.1"
      December20°F37°F28°F1.8"

      Annex 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.
      IndexAnnexOregonNational
      Air quality index363242
      Pollution index1,647,3107,156,3562,726,193

      Annex air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality293
      Days with moderate air quality60
      Days w/ poor A.Q. for sensitive groups9
      Days with unhealthy air quality3

      Annex air quality information

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

      Average monthly Annex temperature with heat index

      Annex monthly precipitation with daily maximum

      Annex monthly snow depth with daily maximum

      Annex monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Weiser, ID5,3583628.0%
      Fruitland, ID5,3903628.0%
      Huntington, OR4543628.0%
      Payette, ID7,6553628.0%
      Ontario, OR11,0313628.0%
      Annex, OR2463628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Sanford, AL2463530.0%
      Garland, AR2463922.0%
      Del Muerto, AZ2461766.0%
      Harvel, IL2464020.0%
      Houstonia, MO2463824.0%
      Annex, OR2463628.0%
      Source: The Annex, OR 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.