TODAY MAY09
TEMPERATURE62
HUMIDITY32
PRESSURE30
WIND COND.290 9.4
  • 6036Mon
  • 6238Tue
  • 6641Wed
  • 6645Thu
  • 6750Fri40%50%
daynightWeather update from Vinton, Vinton Veterans Memorial Airpark Airport at

Key findings

  • The highest monthly average temperature in Keystone for July is 74.1 degrees
  • The lowest monthly average temperature in Keystone for January is 21.3 degrees
  • The most monthly precipitation in Keystone occurs in June with 8.3 inches
  • The air quality index in Keystone is 22% better than the national average
  • The pollution index in Keystone is 92% better than the national average

Compare Keystone, IA Weather

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      Keystone 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
      January13°F30°F21°F0.8"
      February15°F33°F23°F2.0"
      March29°F48°F38°F3.9"
      April40°F62°F50°F4.8"
      May50°F74°F61°F6.0"
      June61°F83°F71°F8.3"
      July64°F85°F74°F7.5"
      August61°F82°F71°F5.6"
      September53°F77°F64°F4.9"
      October42°F64°F52°F7.5"
      November31°F49°F39°F5.2"
      December19°F34°F26°F4.0"

      Keystone 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.
      IndexKeystoneIowaNational
      Air quality index393950
      Pollution index416,1141,643,8365,066,862

      Keystone air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality287
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Keystone air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.001%
      Lead0.000%
      Mercury0.000%

      Average monthly Keystone temperature with heat index

      Keystone monthly precipitation with daily maximum

      Keystone monthly snow depth with daily maximum

      Keystone monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Chelsea, IA2423922%
      Hartwick, IA983922%
      West Amana, IA2123922%
      Norway, IA5253922%
      Traer, IA1,7363922%
      Keystone, IA6313922%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Jarratt, VA6314412%
      Chrisney, IN6314314%
      June Lake, CA631476%
      Queenstown, MD6314118%
      Soldiers Grove, WI6303530%
      Keystone, IA6313922%
      Source: The Keystone, 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.