August 2013 Climatic Summary
 
August temperatures across the entire region were very slightly above average for the month. The locations with the coolest departure from average were Interior and Newcastle, which were 2.3 degrees below normal, while the location with the warmest departure was Custer, at 3.3 degrees above normal.
 
Precipitation in August averaged around 158 percent of normal across the entire area.  A few locations across the Black Hills and the western South Dakota plains were better than 200 percent above average for precipitation. Hot Springs had 6.22 inches of precipitation for August, which was 351 percent of normal. Far south central South Dakota was slightly below normal for August precipitation.
 
August storm summary...
 
The active pattern that started in July continued into the middle of August, bringing nearly a daily occurrence of thunderstorms to much of the area. After about the 15th of August, a much warmer and drier weather pattern took over. Some of the more notable storm days are listed below.
 
August 5th – An area of low pressure along with a weak frontal boundary helped produce showers and storms across parts of Northeast Wyoming and the Black Hills area. Nickel to golf ball sized hail fell with the stronger storms. As the storms moved onto the plains, several locations reported 60 to 70 mph wind gusts.
 
August 11th – A stalled out frontal boundary across the Black Hills area was the focus for severe thunderstorms, including one that produced a tornado just south of Hill City. This very severe storm blew up near west of Pactola reservoir and traveled south. Along with the weak tornado, golf ball hail fell around Hill City and Keystone, south to Custer, Pringle and Hot Springs. Just south of Custer, plows had to be called out to clear 3 miles of highway covered in several inches of hail.
 
LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
101
27th
89
17th
98
28th
Min. Temp.
54
16th
44
6th
50
7th
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
3.04
 
2.91
 
1.27
 
Snowfall
0.0
 
0.0
 
0.0
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
1.16
30th
1.27
13th
0.38
11th
Max. Snowfall
 
 
 
 
 
 

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