TODAY FEB28
TEMPERATURE39
HUMIDITY78
PRESSURE29.88
WIND COND.290 27.7
  • 4223Mon
  • 5031Tue
  • 5328Wed
  • 4928Thu
  • 4827Fri
daynightWeather update from Marshall County Airport at

Key findings

  • The highest monthly average temperature in Roanoke for July is 74 degrees
  • The lowest monthly average temperature in Roanoke for January is 25 degrees
  • The most monthly precipitation in Roanoke occurs in August with 8.3 inches
  • The air quality index in Roanoke is 18% better than the national average
  • The pollution index in Roanoke is 53% worse than the national average

Compare Roanoke, IL Weather

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      Roanoke 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
      January18°F34°F25°F3.2"
      February19°F36°F27°F3.2"
      March32°F51°F41°F5.1"
      April42°F64°F52°F6.5"
      May53°F74°F63°F7.0"
      June62°F82°F72°F7.0"
      July65°F85°F74°F7.2"
      August64°F84°F73°F8.3"
      September57°F78°F66°F7.1"
      October45°F65°F54°F6.0"
      November34°F52°F42°F4.6"
      December23°F38°F30°F3.8"

      Roanoke 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.
      IndexRoanokeIllinoisNational
      Air quality index414150
      Pollution index7,745,2003,347,2955,066,862

      Roanoke air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Roanoke air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.070%
      Carbon Tetrachloride0.020%
      Lead0.860%
      Mercury0.210%

      Average monthly Roanoke temperature with heat index

      Roanoke monthly precipitation with daily maximum

      Roanoke monthly snow depth with daily maximum

      Roanoke monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Dana, IL1210100%
      Toluca, IL1,3160100%
      Rutland, IL2340100%
      Metamora, IL3,6324118%
      Washburn, IL1,0074118%
      Roanoke, IL2,1464118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Sewall's Point, FL2,1463628%
      Hull, IA2,1463628%
      Cimarron, KS2,1461570%
      Star City, AR2,1454510%
      Waldport, OR2,1451766%
      Roanoke, IL2,1464118%
      Source: The Roanoke, 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.