TODAY NOV02
TEMPERATURE46
HUMIDITY99
PRESSURE
WIND COND.119 1.6
  • 5736Sun20%
  • 6035Mon50%40%
  • 5731Tue30%
  • 6030Wed
  • 6733Thu
daynightWeather update from ILLINOIS VALLEY AIRPORT at
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Weather Quick Facts

  • The highest monthly average temperature in O'Brien for September is 59.1 degrees
  • The lowest monthly average temperature in O'Brien for December is 46.2 degrees
  • The most monthly precipitation in O'Brien occurs in November with 14.5 inches
  • The air quality index in O'Brien is 38% better than the national average
  • The pollution index in O'Brien is 408% worse than the national average

Compare O'Brien, OR Weather

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      O'Brien 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
      January40°F56°F47°F14.3"
      February41°F56°F47°F10.3"
      March42°F56°F48°F14.1"
      April43°F59°F50°F9.9"
      May47°F64°F54°F6.0"
      June50°F68°F58°F8.1"
      July52°F69°F59°F2.7"
      August52°F69°F59°F1.5"
      September52°F71°F59°F6.0"
      October49°F66°F56°F11.9"
      November44°F58°F50°F14.5"
      December40°F54°F46°F14.1"

      O'Brien 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.
      IndexO'BrienOregonNational
      Air quality index263242
      Pollution index13,842,6007,156,3562,726,193

      O'Brien air quality

      MeasurementTotal
      Days measured365
      Days with good air quality283
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic0.020%
      Benzene0.210%
      Carbon Tetrachloride0.030%
      Lead0.030%
      Mercury0.020%

      Average monthly O'Brien temperature with heat index

      O'Brien monthly precipitation with daily maximum

      O'Brien monthly snow depth with daily maximum

      O'Brien monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Takilma, OR4652648.0%
      Cave Junction, OR2,1532648.0%
      Kerby, OR2822648.0%
      Selma, OR9132648.0%
      O'Brien, OR6392648.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Norfolk, CT6393726.0%
      Swea City, IA6391570.0%
      Apple Canyon Lake, IL6392942.0%
      New Market, IN6394216.0%
      Sicily Island, LA6393432.0%
      O'Brien, OR6392648.0%
      Source: The O'Brien, 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.