September 2007 Climatic Summary

The first five days of September were hot and mainly dry, with temperatures averaging 10 to 14 degrees above normal. Severe thunderstorms developed from Custer to Oelrichs on September 2 producing winds of 60 miles per hour. On September 6 a cold front pushed across the region bringing scattered thunderstorms to the region. An isolated severe thunderstorm brought nickel size hail to Nemo in Lawrence county. Scattered showers and cool temperatures were the rule for September 7 through 10. The first frost, and in some locations a freeze, occurred on the morning of September 10. Warmer temperatures returned for September 11 and 12. A strong cold front pushed across the area early on September 13 bringing windy and much colder conditions for September 13 and 14, along with some scattered showers and thunderstorms. The morning of September 14 saw the first widespread freeze across the area. Warm and dry weather returned for September 15 through 17.  September 18 through 22 saw above normal temperatures and mainly dry weather. A few areas had scattered showers. On September 23 showers moved across the region with scattered thunderstorms over central and south central South Dakota. An isolated severe thunderstorm produced 60 mph winds near Milesville in Haakon county. September 24 through 27 saw seasonal temperatures and mainly dry weather. A few scattered showers were reported over central and south central South Dakota. September 28 through 30 saw a return to above normal temperatures. A few scattered showers occurred on the South Dakota plains on September 29 and 30, with a few thunderstorms reported in south central South Dakota.
September was a warm month with temperatures averaging 3 to 4 degrees above normal. All reporting sites reported above normal temperatures. Temperatures ranged from 5.1 degrees above normal in Hot Springs to 0.6 degrees above normal at Newell.
September was a very dry month with precipitation averaging only 55 to 65 percent of normal across the region. Only 7 locations reported above normal precipitation as isolated thunderstorms brought heavy rain to them. Precipitation ranged from 224 percent of normal at Cedar Butte 1NE to only a trace of rainfall at Hoover. Rainfall deficits for the month averaged 0.54 inches.


Temperature Data Rapid City   Lead   Gillette  
  Temperature Date Temperature Date Temperature  Date
Maximum Temperature 98 degrees 3rd 89 degrees 3rd 94 degrees 4th
Minimum Temperature 29 degrees 14th 30 degrees 14th 26 degrees 14th
Precipitation Data Rapid City   Lead   Gillette  
Monthly  Data Amount Data Amount Date Amount Date
Precipitation 0.83 inches   0.79 inches   0.63 inches  
Snowfall 0.0 inches   0.0 inches   0.0 inches  
Daily Data            
Maximum Precipitation 0.34 inches 6th 0.34 inches 6th 0.34 inches 19th
Maximum Snowfall 0.0 inches   0.0 inches   0.0 inches  


Temperature Data   Western South Dakota     Northeastern Wyoming  
  Temperature Site Date Temperature Site Date
Maximum Temperature 85 degrees Maurine 10 SW 29th 84 degrees Devil's Tower 30th
Minimum Temperature -2 degrees Custer        Medicine Mtn 7th                     6th -2 degrees Sundance 7th
Precipitation Data   Western South Dakota     Northeastern Wyoming  
Monthly Data Amount Site Date Amount Site Date
Maximum Precipitation 2.93 inches Winner   1.85 inches Upton  
Minimum Precipitation 0.49 inches Spearfish   0.61 inches Hulett  
Maximum Snowfall 12.4 inches Lead   3.4 inches Wright 12W  
Minimum Snowfall 0.0 inhces Wasta   0.0 inches Several Locations  
Daily Data            
Maximum Precipitation 1.39 inches Winner 22nd 0.65 inches Moorcroft 20th
Maximum Snowfall 6.1 inches Lead 11th 1.7 inches Wright 12W 5th



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