Tornado activity: Rapid City-area historical tornado activity is significantly below South Dakota state average.It is 57% smaller than the overall U.S. average.. On 5/11/1991, a category F3 (max. DAILY CLIMATE REPORT - issued daily: Detailed daily weather statistics (usually for yesterday), including temperature, precipitation, degree days, wind, humidity, sunrise/sunset, and record temperature data for the following day. Monthly: 1981-2010 normals Even the driest month still has a lot of rainfall. Station Data. CityRating.com now offers an average city relative humidity chart that displays the annual and monthly humidity for dozens of cities. Rapid City records an average of 9 thunderstorms days … May 28th to October 7th. South Dakota, the 17th largest state in the nation, covers so much area that it has several different geographic areas, each with its own weather pattern. based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Temperature by: Fahrenheit / Centigrade This location is classified as Dfa by Köppen and Geiger. The best times to visit Rapid City for ideal weather are. Relative humidity is probalby the second most popular factor that people take into consideration when looking for the weather of a city to live in. In July, the warmest month, the average day time temperature rises to 85.5°F. Rapid City climate summary The Rapid City lies on 990m above sea level In Rapid City, the climate is cold and temperate. In Rapid City, South Dakota, the average low-temperature is 22.1°F (-5.5°C). Rainfall In Rapid City, during November, the rain falls for 5.3 days and regularly aggregates up to 0.5" (13.5mm) of precipitation. … Monthly averages Rapid City-Ellsworth AFB Longitude: -103.1, Latitude: 44.15 Average weather Rapid City-Ellsworth AFB, SD - 57769. Thunderstorms produce less rainfall, and drier conditions increase the wildfire potential in the Black Hills. Low temperatures average in the 50s, although 40s--and even 30s--can occur at the higher elevations like Deerfield. Rapid City. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. There is significant rainfall throughout the year in Rapid City. The most pleasant months of the year for Rapid City are June, September and August. Read below for more weather and travel details. Preliminary Monthly Climate Data (CF6): step 1) Rapid City Airport, SD Rapid City NWS, SD Buffalo, SD Custer, SD Faith, SD Philip, SD Pine Ridge, SD Winner, SD Gillette, WY The tables below display average monthly climate and weather indicators in Rapid City South Dakota. Rapid City's coldest month is January when the average temperature overnight is 11.3°F. To access climate data beyond 2 months, Please contact the National Climatic Data Center. 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