TODAY JUL07
TEMPERATURE92
HUMIDITY44
PRESSURE29.95
WIND COND.300 13
  • 9374Wed
  • 9271Thu30%50%
  • 8967Fri50%
  • 8966Sat
  • 8564Sun
daynightWeather update from Chicago / West Chicago, Dupage Airport at

Key findings

  • The highest monthly average temperature in Sleepy Hollow for July is 74 degrees
  • The lowest monthly average temperature in Sleepy Hollow for January is 24 degrees
  • The most monthly precipitation in Sleepy Hollow occurs in May with 4.5 inches
  • The air quality index in Sleepy Hollow is 11% worse than the national average
  • The pollution index in Sleepy Hollow is 89% better than the national average

Compare Sleepy Hollow, IL Weather

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      Sleepy Hollow 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
      January16°F32°F24°F1.4"
      February17°F34°F25°F1.2"
      March30°F49°F38°F2.2"
      April39°F62°F50°F3.8"
      May49°F73°F60°F4.5"
      June59°F82°F70°F4.4"
      July63°F85°F74°F4.1"
      August62°F83°F72°F3.8"
      September54°F77°F65°F3.4"
      October43°F64°F53°F3.1"
      November32°F50°F40°F1.9"
      December21°F36°F29°F2.1"

      Sleepy Hollow 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.
      IndexSleepy HollowIllinoisNational
      Air quality index554150
      Pollution index543,5163,347,2955,066,862

      Sleepy Hollow air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality121
      Days with moderate air quality227
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality1

      Sleepy Hollow air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Sleepy Hollow temperature with heat index

      Sleepy Hollow monthly precipitation with daily maximum

      Sleepy Hollow monthly snow depth with daily maximum

      Sleepy Hollow monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Island Lake, IL8,0253922%
      Holiday Hills, IL6983922%
      Oakwood Hills, IL2,1153922%
      Prairie Grove, IL1,7043922%
      Wauconda, IL13,5493922%
      Sleepy Hollow, IL3,3385510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      East Rockingham, NC3,3384118%
      Camden, ME3,3383628%
      Hurley, NY3,3373628%
      Andrews AFB, MD3,336476%
      Waterloo, WI3,3413726%
      Sleepy Hollow, IL3,3385510%
      Source: The Sleepy Hollow, 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.