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Key findings

  • The highest monthly average temperature in Rapid City for July is 77.9 degrees
  • The lowest monthly average temperature in Rapid City for December is 24.3 degrees
  • The most monthly precipitation in Rapid City occurs in October with 36.4 inches
  • The air quality index in Rapid City is 12% better than the national average
  • The pollution index in Rapid City is 28% better than the national average

Compare Rapid City, SD Weather

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      Rapid City 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
      January18°F40°F27°F1.2"
      February18°F40°F27°F1.3"
      March31°F56°F41°F1.7"
      April35°F58°F45°F11.2"
      May46°F69°F56°F12.4"
      June57°F81°F68°F3.1"
      July65°F93°F78°F3.2"
      August61°F87°F73°F5.4"
      September51°F81°F64°F1.4"
      October40°F64°F50°F36.4"
      November29°F51°F39°F3.7"
      December17°F35°F24°F1.5"

      Rapid City 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.
      IndexRapid CitySouth DakotaNational
      Air quality index443650
      Pollution index1,968,790345,6232,726,193

      Rapid City air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality274
      Days with moderate air quality87
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Rapid City air quality information

      PollutantTotal
      Arsenic0.003%
      Benzene0.030%
      Carbon Tetrachloride0.004%
      Lead0.020%
      Mercury0.010%

      Average monthly Rapid City temperature with heat index

      Rapid City monthly precipitation with daily maximum

      Rapid City monthly snow depth with daily maximum

      Rapid City monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Summerset, SD2,1554412.0%
      Caputa, SD04412.0%
      Keystone, SD3184412.0%
      Ashland Heights, SD1,0704412.0%
      Colonial Pine Hills, SD2,0694412.0%
      Rapid City, SD72,4414412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Waldorf, MD72,413476.0%
      Layton, UT72,4134510.0%
      Iowa City, IA72,3853530.0%
      Goodyear, AZ72,6297448.0%
      Jonesboro, AR72,6384510.0%
      Rapid City, SD72,4414412.0%
      Source: The Rapid City, SD 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.