TODAY MAR28
TEMPERATURE21
HUMIDITY99
PRESSURE101930
WIND COND.
  • 5434Fri60%
  • 5031Sat40%
  • 4934Sun60%
  • 4730Mon60%80%
  • 4929Tue30%20%
daynightWeather update from Sparta, Sparta / Fort McCoy Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Ontario for July is 70.5 degrees
  • The lowest monthly average temperature in Ontario for January is 18.2 degrees
  • The most monthly precipitation in Ontario occurs in July with 6.2 inches
  • The air quality index in Ontario is 17% better than the national average
  • The pollution index in Ontario is 24% better than the national average

Compare Ontario, WI 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
      January8°F28°F18°F1.0"
      February9°F30°F20°F0.6"
      March24°F46°F34°F1.5"
      April34°F59°F46°F3.7"
      May44°F71°F57°F4.5"
      June54°F80°F67°F5.6"
      July57°F84°F71°F6.2"
      August56°F81°F68°F4.8"
      September48°F74°F60°F5.4"
      October37°F61°F48°F3.4"
      November27°F46°F36°F1.5"
      December14°F32°F23°F2.3"

      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.
      IndexOntarioWisconsinNational
      Air quality index356942
      Pollution index2,073,1702,842,4182,726,193

      Ontario air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality310
      Days with moderate air quality55
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Ontario air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.020%
      Carbon Tetrachloride0.001%
      Lead0.010%
      Mercury0.040%

      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.
      La Farge, WI9303530.0%
      Viola, WI7433530.0%
      Wilton, WI5423530.0%
      Melvina, WI803530.0%
      Viroqua, WI4,4723530.0%
      Ontario, WI4773530.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Verndale, MN4772942.0%
      Burlington Junction, MO4774314.0%
      Oak Grove Village, MO477548.0%
      Morven, NC4774020.0%
      Hildreth, NE4771962.0%
      Ontario, WI4773530.0%
      Source: The Ontario, WI 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.