TODAY DEC22
TEMPERATURE41
HUMIDITY98
PRESSURE
WIND COND.250 11.3
  • 5143Sun90%100%
  • 5245Mon100%
  • 5139Tue90%40%
  • 4844
  • 5145Thu
daynightWeather update from ROCKHOUSE 1 at
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Weather Quick Facts

  • The highest monthly average temperature in Monmouth for August is 68.9 degrees
  • The lowest monthly average temperature in Monmouth for December is 40 degrees
  • The most monthly precipitation in Monmouth occurs in December with 7.4 inches
  • The air quality index in Monmouth is 24% better than the national average
  • The pollution index in Monmouth is 17% worse than the national average

Compare Monmouth, OR Weather

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      Monmouth 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
      January34°F49°F41°F5.6"
      February35°F53°F43°F4.1"
      March37°F58°F47°F5.4"
      April39°F63°F50°F2.9"
      May45°F71°F57°F2.3"
      June50°F76°F62°F1.3"
      July54°F86°F69°F0.3"
      August54°F86°F69°F0.4"
      September50°F80°F63°F1.8"
      October43°F66°F54°F4.1"
      November38°F55°F46°F6.7"
      December33°F48°F40°F7.4"

      Monmouth 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.
      IndexMonmouthOregonNational
      Air quality index323242
      Pollution index3,182,1807,156,3562,726,193

      Monmouth air quality

      MeasurementTotal
      Days measured356
      Days with good air quality302
      Days with moderate air quality54
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.040%
      Carbon Tetrachloride0.030%
      Lead0.190%
      Mercury0.110%

      Average monthly Monmouth temperature with heat index

      Monmouth monthly precipitation with daily maximum

      Monmouth monthly snow depth with daily maximum

      Monmouth monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Kings Valley, OR1941766.0%
      Millersburg, OR2,2342844.0%
      Jefferson, OR3,3482844.0%
      Adair Village, OR1,1072844.0%
      Marion, OR4162844.0%
      Monmouth, OR10,4113236.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Cape Canaveral, FL10,4113628.0%
      Portage, WI10,4123530.0%
      Mono, ON10,413n/a 
      Frederick, CO10,414476.0%
      Fort Madison, IA10,4072942.0%
      Monmouth, OR10,4113236.0%
      Source: The Monmouth, 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.