TODAY NOV22
TEMPERATURE41
HUMIDITY89
PRESSURE101390
WIND COND.300 16.6
  • 4434Fri
  • 4432Sat
  • 5042Sun
  • 4623Mon
  • 3623Tue
daynightWeather update from Chicago / West Chicago, Dupage Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Sleepy Hollow for July is 73.7 degrees
  • The lowest monthly average temperature in Sleepy Hollow for January is 23.8 degrees
  • The most monthly precipitation in Sleepy Hollow occurs in May with 4.5 inches
  • The air quality index in Sleepy Hollow is 31% worse than the national average
  • The pollution index in Sleepy Hollow is 80% 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 index554142
      Pollution index543,5163,148,6942,726,193

      Sleepy Hollow air quality

      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

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Wauconda, IL13,6293922.0%
      Holiday Hills, IL6533922.0%
      Island Lake, IL8,1123922.0%
      Oakwood Hills, IL2,5433922.0%
      Prairie Grove, IL2,0233922.0%
      Sleepy Hollow, IL3,2765510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Lake California, CA3,2764118.0%
      Waller, TX3,276524.0%
      Marysville, KS3,2753236.0%
      Fort Edward, NY3,2753530.0%
      Okemah, OK3,2753628.0%
      Sleepy Hollow, IL3,2765510.0%
      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.