TODAY FEB28
TEMPERATURE38
HUMIDITY89
PRESSURE29.75
WIND COND.180 7.6
  • 3517Mon
  • 4730Tue
  • 4928Wed
  • 5328Thu
  • 4624Fri
daynightWeather update from Rockford, Greater Rockford Airport at

Key findings

  • The highest monthly average temperature in Stillman Valley for July is 74 degrees
  • The lowest monthly average temperature in Stillman Valley for January is 23 degrees
  • The most monthly precipitation in Stillman Valley occurs in August with 5.3 inches
  • The air quality index in Stillman Valley is 16% better than the national average
  • The pollution index in Stillman Valley is 66% better than the national average

Compare Stillman Valley, IL Weather

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      Stillman Valley 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°F32°F23°F1.7"
      February15°F35°F25°F1.6"
      March27°F50°F38°F2.7"
      April37°F64°F50°F4.3"
      May47°F75°F61°F3.4"
      June58°F84°F71°F5.1"
      July62°F86°F74°F4.9"
      August61°F84°F72°F5.3"
      September53°F79°F65°F2.8"
      October42°F66°F53°F2.9"
      November30°F51°F40°F2.4"
      December18°F36°F27°F2.5"

      Stillman Valley 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.
      IndexStillman ValleyIllinoisNational
      Air quality index424150
      Pollution index1,721,0903,347,2955,066,862

      Stillman Valley air quality information

      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

      Stillman Valley air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.020%
      Carbon Tetrachloride0.001%
      Lead0.002%
      Mercury0.000%

      Average monthly Stillman Valley temperature with heat index

      Stillman Valley monthly precipitation with daily maximum

      Stillman Valley monthly snow depth with daily maximum

      Stillman Valley monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Davis Junction, IL2,4394216%
      New Milford, IL6444216%
      Pecatonica, IL2,3154216%
      Hillcrest, IL1,2584216%
      Rochelle, IL9,3854216%
      Stillman Valley, IL1,0754216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Newport, DE1,075512%
      Nassau, NY1,0753726%
      Encinal, TX1,0754118%
      Gideon, MO1,0752648%
      Buckeystown, MD1,0754020%
      Stillman Valley, IL1,0754216%
      Source: The Stillman Valley, 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.