TODAY AUG20
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 7966Mon80%70%
  • 7856Tue30%
  • 7753Wed
  • 7959Thu
  • 8065Fri
daynightWeather update from Marshall County Airport at

Roanoke Average Weather

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"

Did you know?

  • 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 3% better than the national average.
  • The pollution index in Roanoke is 52% worse than the national average.

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Compare Roanoke, IL Weather To Other Cities

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 index484150
Pollution index7,745,2003,347,2955,066,862

Roanoke air quality information

MeasurementTotal
Days measured365
Days with good air quality207
Days with moderate air quality132
Days w/ poor A.Q. for sensitive groups21
Days with unhealthy air quality5

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, IL121198%
Toluca, IL1,316198%
Rutland, IL234198%
Congerville, IL5433628%
Hudson, IL1,7043628%
Roanoke, IL2,146484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Cimarron, KS2,146688%
Sewall's Point, FL2,1462942%
Hull, IA2,1464020%
Waldport, OR2,1451766%
Anahuac, TX2,1474412%
Roanoke, IL2,146484%
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.