TODAY NOV24
TEMPERATURE34
HUMIDITY93
PRESSURE101460
WIND COND.
  • 5041Sun30%
  • 4623Mon20%
  • 3322Tue
  • 3623Wed30%30%
  • 362120%20%
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Weather Quick Facts

  • The highest monthly average temperature in Janesville for July is 72.3 degrees
  • The lowest monthly average temperature in Janesville for January is 20.9 degrees
  • The most monthly precipitation in Janesville occurs in June with 9.5 inches
  • The air quality index in Janesville is 10% better than the national average
  • The pollution index in Janesville is 59% better than the national average

Compare Janesville, WI Weather

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      Janesville 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
      January14°F28°F21°F1.7"
      February16°F30°F23°F2.3"
      March29°F46°F36°F2.7"
      April39°F59°F48°F4.4"
      May50°F71°F60°F4.6"
      June60°F79°F69°F9.5"
      July64°F82°F72°F7.7"
      August62°F80°F71°F6.1"
      September54°F74°F63°F4.2"
      October43°F61°F51°F4.4"
      November32°F47°F38°F3.3"
      December20°F32°F26°F1.1"

      Janesville 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.
      IndexJanesvilleWisconsinNational
      Air quality index386942
      Pollution index1,129,4402,842,4182,726,193

      Janesville air quality

      MeasurementTotal
      Days measured203
      Days with good air quality185
      Days with moderate air quality18
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.003%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.020%

      Average monthly Janesville temperature with heat index

      Janesville monthly precipitation with daily maximum

      Janesville monthly snow depth with daily maximum

      Janesville monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lake Koshkonong, WI9583726.0%
      Whitewater, WI14,7623726.0%
      Lake Lorraine, WI2593726.0%
      Hanover, WI1193824.0%
      Edgerton, WI5,5943824.0%
      Janesville, WI64,4153824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Noblesville, IN64,4304216.0%
      Castro Valley, CA64,3924020.0%
      Eden Prairie, MN64,481468.0%
      Port Charlotte, FL64,3353628.0%
      Tulare, CA64,5466632.0%
      Janesville, WI64,4153824.0%
      Source: The Janesville, 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.