TODAY NOV21
TEMPERATURE37
HUMIDITY93
PRESSURE100640
WIND COND.320 29.5
  • 4432Fri
  • 4332Sat
  • 4839Sun
  • 4522Mon
  • 3522Tue
daynightWeather update from Janesville-Rock County at
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Weather Quick Facts

  • The highest monthly average temperature in Harvard for July is 70.3 degrees
  • The lowest monthly average temperature in Harvard for January is 21.9 degrees
  • The most monthly precipitation in Harvard occurs in July with 11.4 inches
  • The air quality index in Harvard is equal to the national average
  • The pollution index in Harvard is 94% better than the national average

Compare Harvard, IL Weather

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      Harvard 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°F30°F22°F2.3"
      February14°F31°F23°F2.8"
      March26°F45°F35°F3.7"
      April36°F58°F46°F5.9"
      May46°F71°F58°F4.8"
      June56°F79°F67°F7.8"
      July59°F82°F70°F11.4"
      August57°F81°F68°F5.4"
      September50°F74°F61°F7.1"
      October40°F61°F50°F5.8"
      November29°F48°F38°F5.2"
      December19°F34°F27°F3.3"

      Harvard 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.
      IndexHarvardIllinoisNational
      Air quality index424142
      Pollution index151,0963,148,6942,726,193

      Harvard air quality

      MeasurementTotal
      Days measured341
      Days with good air quality240
      Days with moderate air quality100
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

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

      Average monthly Harvard temperature with heat index

      Harvard monthly precipitation with daily maximum

      Harvard monthly snow depth with daily maximum

      Harvard monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lake Ivanhoe, WI3983726.0%
      Delavan Lake, WI2,7523726.0%
      Greenwood, IL3523726.0%
      Springfield, WI1313726.0%
      Fontana-on-Geneva Lake, WI1,5183726.0%
      Harvard, IL9,2034216.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Saint-Zotique, QC9,205n/a 
      Lynwood, IL9,2105510.0%
      Valley, AL9,1954216.0%
      Madeira, OH9,211548.0%
      New Richmond, WI9,212468.0%
      Harvard, IL9,2034216.0%
      Source: The Harvard, IL 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.