TODAY MAY18
TEMPERATURE65
HUMIDITY93
PRESSURE30.1
WIND COND.150 27.7
  • 7965Wed30%40%
  • 8365Thu
  • 8564Fri
  • 8565Sat
  • 8766Sun
daynightWeather update from Springfield - Abraham Lincoln Capital Airport at

Key findings

  • The highest monthly average temperature in Rochester for July is 76.6 degrees
  • The lowest monthly average temperature in Rochester for January is 28.5 degrees
  • The most monthly precipitation in Rochester occurs in June with 5.5 inches
  • The air quality index in Rochester is 20% better than the national average
  • The pollution index in Rochester is 1% worse than the national average

Compare Rochester, IL Weather

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      Rochester 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
      January20°F38°F29°F2.1"
      February22°F41°F31°F1.9"
      March34°F56°F44°F2.9"
      April44°F68°F56°F4.3"
      May54°F77°F65°F4.5"
      June64°F86°F74°F5.5"
      July66°F88°F77°F4.3"
      August64°F86°F75°F3.2"
      September57°F81°F68°F3.7"
      October46°F69°F56°F3.7"
      November36°F55°F45°F2.5"
      December26°F41°F33°F2.8"

      Rochester 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.
      IndexRochesterIllinoisNational
      Air quality index404150
      Pollution index5,136,0803,347,2955,066,862

      Rochester air quality information

      MeasurementTotal
      Days measured360
      Days with good air quality287
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Rochester air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.090%
      Carbon Tetrachloride0.010%
      Lead0.390%
      Mercury0.020%

      Average monthly Rochester temperature with heat index

      Rochester monthly precipitation with daily maximum

      Rochester monthly snow depth with daily maximum

      Rochester monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Curran, IL2144020%
      Jeisyville, IL924020%
      Mechanicsburg, IL6234020%
      Auburn, IL5,0064020%
      Buffalo, IL5034020%
      Rochester, IL3,6874020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Harrisburg, OR3,6873824%
      Independence, MN3,687468%
      Northern Cambria, PA3,6863824%
      Harrington, DE3,6884216%
      Pantops, VA3,6884020%
      Rochester, IL3,6874020%
      Source: The Rochester, 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.