May 2012 Climatic Summary
 
May temperatures were near average across much of the area this month. The average monthly temperature was only 1.2 degrees above normal across the region. The location with the highest departure in May was Custer, with an average temperature of 3.9 degrees above normal. The location with the coolest departure in May was Devil’s Tower, with an average temperature of 1.8 degrees below average.
 
Precipitation in May averaged around 70 percent of normal across the entire area.  The wettest location was Wood, SD with 4.12 inches of rain. This was 125% of normal. The driest location was Mission 14S with only 0.88 inches of rain. This was only 26% of normal for May. No measureable snow fell across the area in May.
 
May storm summary...
 
May 5th – A low pressure system moved across the area during the early morning hours. Showers and thunderstorms produced dime to golf ball sized hail from the Black Hills area through south central South Dakota.
 

May 18th – A stationery frontal boundary was draped across the northern plains, providing a focus for showers and thunderstorms. Nickel to quarter sized hail and 50 to 70 mph wind gusts were reported across the Black Hills area, then east into Haakon and Jackson counties. A severe storm moved through Kadoka with estimated 80 to 90 mph winds, blowing roofs off of a couple of buildings and blowing down power poles.

LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
90
16th
84
16th
92
16th
Min. Temp.
37
9th
30
12th & 13th
27
8th
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
2.18
 
2.87
 
3.21
 
Snowfall
0.0
 
0.0
 
0.0
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
0.60
18th
0.68
18th
0.87
27th
Max. Snowfall
0.0
 
0.0
 
0.0
 

 

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