TODAY MAY28
TEMPERATURE70
HUMIDITY90
PRESSURE29.9
WIND COND.130 9.2
  • 7860Thu40%80%
  • 7352Fri40%
  • 7255Sat
  • 7253Sun
  • 7461Mon
daynightWeather update from Springfield - Abraham Lincoln Capital Airport at
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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"

Did you know?

  • The highest monthly average temperature in Rochester for July is 77 degrees.
  • The lowest monthly average temperature in Rochester for January is 29 degrees.
  • The most monthly precipitation in Rochester occurs in June with 5.5 inches.
  • The air quality index in Rochester is 30% better than the national average.
  • The pollution index in Rochester is 1% worse than the national average.

Compare Rochester, IL Weather To Other Cities

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      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 index354150
      Pollution index5,136,0803,347,2955,066,862

      Rochester air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality316
      Days with moderate air quality49
      Days w/ poor A.Q. for sensitive groups
      Days with unhealthy air quality

      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.
      Buffalo, IL5033530%
      Clear Lake, IL2193530%
      Divernon, IL1,2013530%
      Jerome, IL1,6623530%
      Mechanicsburg, IL6233530%
      Rochester, IL3,6873530%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Independence, MN3,6874412%
      Harrisburg, OR3,6873628%
      Waverly, NE3,6863432%
      Harrington, DE3,6883824%
      Northern Cambria, PA3,6863628%
      Rochester, IL3,6873530%
      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.