April 2013 Climatic Summary
 
Western South Dakota and Northeast Wyoming endured one of the coldest and snowiest Aprils on record. April temperatures across the entire region were around 7 degrees below average for the month. The location with the coolest departure from average was Spearfish, which was 9.6 degrees below normal, while the location with the warmest departure was Custer, at 4.9 degrees below normal.
 
Precipitation in April averaged around 116 percent of normal across the entire area.  The wettest and snowiest areas were over the northern and central Black Hills, where 125 to 150 percent of normal precipitation was reported. The driest areas were across northwestern South Dakota, where precipitation averaged 50 to 70 percent of normal. Dupree reported only 55% of normal precipitation for the month. Mt. Rushmore received nearly twice the normal amount of precipitation for the month.
 
Snowfall averaged around 400% of normal across the area. Snowfall was the heaviest over the northern and central Black Hills, where 3 to 5 feet of snow fell for April. The location with the largest departure from normal was in Martin, where over 29 inches of snow fell. This was a little over 10 times the normal amount of snowfall for the month. The highest snowfall totals were in Lead, where 56.5 inches of snowfall was observed.
 
April storm summary...
 
April 9-10th – Cold Canadian high pressure was in place across the area as a strong low pressure system crossed the Northern Plains. Ample moisture from this system produced 6 to 30 inches of snowfall across the area.
 
April 16-17th – Another low pressure system crossed the Northern Plains, producing an additional 2 to 8 inches of snow across mainly southern areas of South Dakota.

April 22nd – A third low pressure system moved out of the central Rockies into the Northern Plains. Another 4 to 16 inches of snow fell across much of Northeast Wyoming and central and southern South Dakota.

LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
78
27th
69
27th
76
27th
Min. Temp.
10
9th
3
9th
3
23rd
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
3.10
 
4.19
 
1.64
 
Snowfall
39.5
 
56.5
 
16.3
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
0.96
9th
1.06
9th
0.65
9th
Max. Snowfall
15.0
9th
15.9
9th
8.0
9th

 

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