TODAY MAR29
TEMPERATURE30
HUMIDITY81
PRESSURE101730
WIND COND.60 9.4
  • 5831Fri30%
  • 5032Sat
  • 5235Sun40%50%
  • 4930Mon70%60%
  • 5028Tue30%
daynightWeather update from Mason City Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Thornton for July is 72.5 degrees
  • The lowest monthly average temperature in Thornton for January is 16.7 degrees
  • The most monthly precipitation in Thornton occurs in June with 5.4 inches
  • The air quality index in Thornton is 64% better than the national average
  • The pollution index in Thornton is 63% better than the national average

Compare Thornton, IA Weather

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      Thornton 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
      January9°F25°F17°F0.7"
      February11°F29°F20°F1.1"
      March25°F44°F34°F2.2"
      April36°F60°F47°F5.1"
      May48°F71°F59°F5.0"
      June58°F81°F69°F5.4"
      July61°F84°F72°F4.2"
      August59°F82°F70°F4.0"
      September51°F76°F62°F4.3"
      October38°F62°F49°F2.7"
      November26°F47°F36°F1.5"
      December13°F29°F21°F1.4"

      Thornton 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.
      IndexThorntonIowaNational
      Air quality index153942
      Pollution index1,013,9601,154,5352,726,193

      Thornton air quality information

      MeasurementTotal
      Days measured118
      Days with good air quality118
      Days with moderate air quality0
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Thornton air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.001%
      Mercury0.000%

      Average monthly Thornton temperature with heat index

      Thornton monthly precipitation with daily maximum

      Thornton monthly snow depth with daily maximum

      Thornton monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Clear Lake, IA7,5941570.0%
      Meservey, IA2771570.0%
      Mason City, IA27,0641570.0%
      Alexander, IA1601570.0%
      Latimer, IA7881570.0%
      Thornton, IA4731570.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Fort Yukon, AK4733824.0%
      Courtland, CA473524.0%
      Canal Point, FL4733628.0%
      Creal Springs, IL4734412.0%
      Karnak, IL4734412.0%
      Thornton, IA4731570.0%
      Source: The Thornton, IA 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.