June 2007 Climatic Summary


A strong upper level low pressure system brought heavy rains to portions of the region on June 1 and 2.  Across northeastern Wyoming and northwestern South Dakota 1.5 to 2.0 inches of rain fell, while the northern Black Hills had 2.0 to 4.0 inches of rain, causing small stream flood in northern Lawrence and southern Butte counties. Elsewhere in northeastern Wyoming and western South Dakota 0.25 to 0.75 inches of rain fell. On June 6 a strong upper level disturbance brought widespread severe weather to the region. Tornados were reported 10 miles southwest of Gillette, 9 miles southwest of Kyle and 5 miles southwest of Kadoka. There were numerous reports of large hail up to the size of golf balls and damaging winds up to 70 miles per hour. This storm system also brought another 1.0 to 2.0 inches of rain to Campbell county in northeastern Wyoming causing flooding on the Little Powder river. Above normal temperatures returned on June 9 and continued through the end of the month with numerous severe weather outbreaks. On June 12 severe thunderstorms in south central South Dakota produced hail to the size of nickels, with  rainfall estimated at 4.5 inches fell in Mellette county, which caused flooding in Norris. Small stream flooding also occurred across Bennett, Jackson, Todd and Tripp counties. On June 16 severe thunderstorms on the plains of western South Dakota produced numerous reports of large hail up to the size of quarters. On June 17 severe thunderstorms over western South Dakota produced hail to the size of quarters and damaging winds up to 60 miles per hour. On June 21 widespread severe weather occurred over western South Dakota with numerous reports of hail to the size of quarters and up to baseball size hail reported in Hot Springs. On June 22 isolated severe thunderstorms occurred over northeastern Wyoming and the Black Hills with hail to the size of quarters. On June 24 severe thunderstorms brought penny sized hail and damaging winds of 70 to 90 miles per hour to northeastern Wyoming, the Black Hills and northwestern South Dakota.  On June 25 a powerful supercell thunderstorm dropped softball size hail from northern Campbell county to Butte county. Additional severe thunderstorms developed across Bennett and Jackson counties with hail to the size of quarters. On June 28 isolated severe thunderstorms produced hail to the size of golf balls in northeastern Wyoming. On June 30 an isolated severe thunderstorm produced golf ball size hail near the Mount Rushmore National Memorial.
June was a warm month with temperatures averaging 2 to 4 degrees above normal. As was the case in May, all locations reported above normal temperatures. Averages ranged from 4.2 degrees above normal at the Mount Rushmore National Memorial to 0.2 degrees above normal at Winner.
June as a whole saw slightly below normal precipitation across the region. Southwestern South Dakota was very dry with only 20 to 30 percent of normal precipitation falling. It was also dry across south central South Dakota and on the plains east of the Black Hills were 50 to 70 percent of normal precipitation fell. The wet spots were in northwestern South Dakota, the northern Black Hills and much of northeastern Wyoming where precipitation was 125 to 150 percent of normal. Precipitation ranged from 169 percent of normal at Lead where 6.42 inches of rain fell and 153 percent of normal in Deadwood 2NE where 6.25 inches of rain fell, to 27 percent of normal at Edgemont where only 0.67 inches of rainfall fell. The rainfall deficit for the month averaged 0.54 inches.

LOCAL EXTREMES

Temperature Data Rapid City   Lead   Gillette  
  Temperature Date Temperature Date Temperature  Date
Maximum Temperature 104 degrees 24th 89 degrees 23rd 95 degrees 23rd
Minimum Temperature 39 degrees 8th 36 degrees 7th 36 degrees 8th
             
Precipitation Data Rapid City   Lead   Gillette  
Monthly  Data Amount Data Amount Date Amount Date
Precipitation 0.96 inches   6.42 inches   2.30 inches  
Snowfall 0.0 inches   0.0 inches   0.0 inches  
             
Daily Data            
Maximum Precipitation 0.46 inches 1st 3.20 inches 1st 1.57 inches 7th
Maximum Snowfall 0.0 inches   0.0 inches   0.0 inches  

REGIONAL EXTREMES

Temperature Data   Western South Dakota     Northeastern Wyoming  
  Temperature Site Date Temperature Site Date
Maximum Temperature 109 degrees Cottonwood   Oglala 1S 26th
26th
100 degrees  Dillinger       Newcastle 24th
24th, 25th
Minimum Temperature 26 degrees Medicine Mtn 8th 28 degrees Upton 14ENE 8th
             
Precipitation Data   Western South Dakota     Northeastern Wyoming  
Monthly Data Amount Site Date Amount Site Date
Maximum Precipitation 7.79 inches St. Onge 2S   4.38 inches Rockypoint 1N  
Minimum Precipitation 0.45 inches Hermosa 3SSW   1.33 inches Dillinger  
Maximum Snowfall 0.0 inches     0.0 inches    
Minimum Snowfall 0.0 inches     0.0 inches    
             
Daily Data            
Maximum Precipitation 3.26 inches Deadwood 2NE 1st 1.67 inches Wright 12W 7th
Maximum Snowfall 0.0 inches     0.0 inches    

MONTHLY RECORDS

LOCATION DATE NEW RECORD OLD RECORD DATE
    NO RECORDS SET    


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