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Key findings

  • The highest monthly average temperature in Janesville for July is 73.7 degrees
  • The lowest monthly average temperature in Janesville for January is 18.7 degrees
  • The most monthly precipitation in Janesville occurs in June with 6.5 inches
  • The air quality index in Janesville is 22% better than the national average
  • The pollution index in Janesville is 80% better than the national average

Compare Janesville, IA 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
      January9°F29°F19°F1.3"
      February11°F33°F22°F1.2"
      March25°F49°F36°F1.9"
      April36°F63°F49°F5.0"
      May47°F74°F60°F4.8"
      June58°F83°F71°F6.5"
      July61°F86°F74°F4.9"
      August58°F84°F71°F4.0"
      September51°F79°F64°F3.4"
      October39°F65°F51°F3.2"
      November27°F50°F38°F1.8"
      December14°F33°F23°F2.1"

      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.
      IndexJanesvilleIowaNational
      Air quality index393950
      Pollution index1,013,9601,643,8365,066,862

      Janesville air quality information

      MeasurementTotal
      Days measured363
      Days with good air quality286
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Janesville air quality information

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

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Elk Run Heights, IA1,0063922%
      Clarksville, IA1,2763922%
      New Hartford, IA6213922%
      Waverly, IA10,0493922%
      Evansdale, IA4,7943922%
      Janesville, IA7953922%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Mountain View, OK7954314%
      North, SC7954314%
      Puako, HI7951668%
      Hamersville, OH795548%
      Adams, TN7954020%
      Janesville, IA7953922%
      Source: The Janesville, IA 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.