TODAY NOV21
TEMPERATURE43
HUMIDITY86
PRESSURE101900
WIND COND.30 7.6
  • 5443Fri70%100%
  • 5131Sat80%20%
  • 4631Sun30%
  • 4531Mon40%40%
  • 4632Tue40%30%
daynightWeather update from Ontario Municipal Airport at
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Weather Quick Facts

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

Compare Ontario, OR Weather

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      Ontario 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"

      Ontario 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.
      IndexOntarioOregonNational
      Air quality index363242
      Pollution index1,647,3107,156,3562,726,193

      Ontario air quality

      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

      Air quality details

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

      Average monthly Ontario temperature with heat index

      Ontario monthly precipitation with daily maximum

      Ontario monthly snow depth with daily maximum

      Ontario monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Payette, ID7,6553628.0%
      Nyssa, OR3,1763628.0%
      Fruitland, ID5,3903628.0%
      Vale, OR2,2103628.0%
      New Plymouth, ID1,6413628.0%
      Ontario, OR11,0313628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Middle Island, NY11,0304314.0%
      Spencer, IA11,0383530.0%
      Doctor Phillips, FL11,0203922.0%
      Franklin Lakes, NJ11,044512.0%
      New Baltimore, VA11,0173824.0%
      Ontario, OR11,0313628.0%
      Source: The Ontario, 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.