TODAY OCT14
TEMPERATURE44
HUMIDITY89
PRESSURE101360
WIND COND.310 27.7
  • 533550%
  • 5128Tue30%
  • 5632Wed
  • 6441Thu
  • 6844Fri
daynightWeather update from Watertown at
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Weather Quick Facts

  • The highest monthly average temperature in Jefferson for July is 71.6 degrees
  • The lowest monthly average temperature in Jefferson for January is 20.6 degrees
  • The most monthly precipitation in Jefferson occurs in June with 7.3 inches
  • The air quality index in Jefferson is 12% better than the national average
  • The pollution index in Jefferson is 3% worse than the national average

Compare Jefferson, WI Weather

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      Jefferson 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
      January13°F28°F21°F3.6"
      February14°F30°F22°F1.7"
      March26°F45°F35°F3.4"
      April37°F59°F47°F6.3"
      May47°F71°F59°F5.1"
      June57°F79°F68°F7.3"
      July61°F83°F72°F3.8"
      August59°F81°F70°F5.7"
      September51°F74°F62°F4.6"
      October41°F61°F50°F6.5"
      November30°F47°F38°F4.2"
      December18°F33°F25°F3.3"

      Jefferson 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.
      IndexJeffersonWisconsinNational
      Air quality index376942
      Pollution index2,796,3102,842,4182,726,193

      Jefferson air quality

      MeasurementTotal
      Days measured205
      Days with good air quality189
      Days with moderate air quality15
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.003%
      Benzene0.040%
      Carbon Tetrachloride0.005%
      Lead0.001%
      Mercury0.004%

      Average monthly Jefferson temperature with heat index

      Jefferson monthly precipitation with daily maximum

      Jefferson monthly snow depth with daily maximum

      Jefferson monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lake Mills, WI5,9363726.0%
      Waterloo, WI3,3343726.0%
      Johnson Creek, WI3,0293726.0%
      Sullivan, WI7103726.0%
      Ashippun, WI1,0273726.0%
      Jefferson, WI8,0113726.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Whitmore Lake, MI8,0104020.0%
      Downingtown, PA8,0124216.0%
      Stone Mills, ON8,012n/a 
      Rockwood, VA8,0084412.0%
      Vermilion River County, AB8,008n/a 
      Jefferson, WI8,0113726.0%
      Source: The Jefferson, 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.