TODAY NOV02
TEMPERATURE66
HUMIDITY38
PRESSURE102370
WIND COND.
  • 7364Sun40%90%
  • 7462Mon70%60%
  • 7147Tue90%20%
  • 6647Wed
  • 6446Thu20%
daynightWeather update from St. Louis Downtown Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Arnold for July is 78.8 degrees
  • The lowest monthly average temperature in Arnold for January is 32.5 degrees
  • The most monthly precipitation in Arnold occurs in April with 5.3 inches
  • The air quality index in Arnold is 28% worse than the national average
  • The pollution index in Arnold is 211% worse than the national average

Compare Arnold, MO Weather

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      Arnold 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
      January24°F43°F32°F1.8"
      February26°F45°F34°F1.6"
      March37°F59°F47°F3.7"
      April47°F70°F58°F5.3"
      May56°F78°F67°F4.8"
      June65°F88°F76°F4.4"
      July68°F90°F79°F3.9"
      August66°F89°F77°F3.1"
      September58°F82°F69°F4.2"
      October47°F71°F58°F3.1"
      November36°F58°F46°F2.8"
      December29°F45°F36°F3.1"

      Arnold 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.
      IndexArnoldMissouriNational
      Air quality index549742
      Pollution index8,473,0501,630,2552,726,193

      Arnold air quality

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic0.020%
      Benzene0.070%
      Carbon Tetrachloride0.020%
      Lead0.010%
      Mercury0.010%

      Average monthly Arnold temperature with heat index

      Arnold monthly precipitation with daily maximum

      Arnold monthly snow depth with daily maximum

      Arnold monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Sappington, MO7,161548.0%
      Centreville, IL4,946548.0%
      Crestwood, MO11,859548.0%
      Valley Park, MO6,813548.0%
      Sauget, IL233548.0%
      Arnold, MO21,144548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Saint-Augustin-de-Desmaures, QC21,143n/a 
      Easley, SC21,149468.0%
      Ashland, OR21,1383628.0%
      Covington, WA21,1314510.0%
      Piqua, OH21,159476.0%
      Arnold, MO21,144548.0%
      Source: The Arnold, MO 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.