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Key findings

  • The highest monthly average temperature in Winthrop Harbor for July is 72 degrees
  • The lowest monthly average temperature in Winthrop Harbor for January is 24 degrees
  • The most monthly precipitation in Winthrop Harbor occurs in June with 4.5 inches
  • The air quality index in Winthrop Harbor is 22% better than the national average
  • The pollution index in Winthrop Harbor is 38% better than the national average

Compare Winthrop Harbor, IL Weather

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      Winthrop Harbor 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°F33°F25°F1.5"
      March28°F45°F36°F2.6"
      April37°F57°F46°F4.1"
      May47°F68°F57°F3.7"
      June57°F77°F67°F4.5"
      July63°F82°F72°F4.4"
      August62°F80°F71°F3.7"
      September55°F73°F64°F3.3"
      October44°F62°F52°F3.4"
      November33°F49°F40°F2.0"
      December22°F36°F29°F2.5"

      Winthrop Harbor 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.
      IndexWinthrop HarborIllinoisNational
      Air quality index394150
      Pollution index3,131,7003,347,2955,066,862

      Winthrop Harbor air quality information

      MeasurementTotal
      Days measured203
      Days with good air quality174
      Days with moderate air quality28
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Winthrop Harbor air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.030%
      Carbon Tetrachloride0.010%
      Lead0.004%
      Mercury0.360%

      Average monthly Winthrop Harbor temperature with heat index

      Winthrop Harbor monthly precipitation with daily maximum

      Winthrop Harbor monthly snow depth with daily maximum

      Winthrop Harbor monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Antioch, IL14,3423922%
      Libertyville, IL20,4353922%
      Venetian Village, IL2,6233922%
      Round Lake Heights, IL3,1103922%
      Wadsworth, IL3,6463922%
      Winthrop Harbor, IL6,8323922%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Greenville, IL6,8334314%
      Milford, OH6,833548%
      Whitinsville, MA6,8314020%
      Barrington, NJ6,831512%
      Mountainside, NJ6,835512%
      Winthrop Harbor, IL6,8323922%
      Source: The Winthrop Harbor, 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.