TODAY APR24
TEMPERATURE65
HUMIDITY28
PRESSURE101080
WIND COND.
  • 7647Wed20%
  • 6947Thu40%
  • 6442Fri30%
  • 6543Sat
  • 6943Sun
daynightWeather update from Ontario Municipal Airport at
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Weather Quick Facts

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

Compare Harper, OR Weather

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      Harper 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"

      Harper 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.
      IndexHarperOregonNational
      Air quality index363242
      Pollution index1,647,3107,156,3562,726,193

      Harper 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

      Harper air quality information

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

      Average monthly Harper temperature with heat index

      Harper monthly precipitation with daily maximum

      Harper monthly snow depth with daily maximum

      Harper monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Harper, OR1043628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Nolic, AZ104476.0%
      Moffat, CO1041668.0%
      Garber, IA1042942.0%
      Houghton, IA1042942.0%
      St. Donatus, IA1042942.0%
      Harper, OR1043628.0%
      Source: The Harper, 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.