June 2012 Climatic Summary
 
June temperatures were well above average across the area this month. The average monthly temperature was 5.1 degrees above normal across the region. The location with the highest departure in June was Gillette 4SE, with an average temperature of 6.9 degrees above normal. The location with the coolest departure in June was Wood, with an average temperature of 2.9 degrees above average.
 
Precipitation in June averaged around 62 percent of normal across the entire area. The average precipitation deficit was around 1 inch. Much of northeast Wyoming averaged around 30% of normal, and northwest South Dakota averaged around 50% of normal. The wettest locations were Cottonwood and Interior, with 4+ inches of rain. The driest location was Bison, with only 0.50 inches of precipitation. No measureable snow fell across the area in June.
 
June significant storm summary...
 
June 7th – Strong to severe thunderstorms developed over the Black Hills and moved east onto the plains. Golf ball sized hail was reported near Custer, and also near Interior. Drifts of hail 1.5 feet deep were also reported in Custer.
 
June 22nd – Severe storms crossed northeast Wyoming and southwestern South Dakota on this day. Baseball sized hail fell near Moorcroft, and golf ball to softball sized hail fell just west of Edgemont. Baseball sized hail was also reported near Provo. The strongest storm, which moved through Fall River County, produced a tornado that caused considerable damage to a ranch just north of Ardmore.
 
June 26th – Strong to marginally severe storms crossed the area during the afternoon and evening hours. Wind gusts of 50 to 60 mph were reported across southern Campbell and Weston counties in the early afternoon. These storms moved through southwest South Dakota during the early evening hours, producing 60 mph wind gusts.

June 30th – Severe storms developed over the southern Black Hills, producing golf ball sized hail near Jewel cave. Additional severe storms crossed northwest portions of South Dakota, producing golf ball sized hail and wind gusts to 70 mph in eastern Meade, Perkins, and Ziebach counties.

LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
106
26th
96
26th
107
24th
Min. Temp.
49
1st
42
12th
42
16th
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
2.73
 
1.47
 
0.77
 
Snowfall
0.0
 
0.0
 
0.0
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
1.02
7th
0.91
7th
0.20
10th
Max. Snowfall
0.0
 
0.0
 
0.0
 

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