April 2008 Climatic Summary


April temperatures were below normal, averaging 1 to 3 degrees below normal. All locations reported below normal temperatures. Long Valley was the warm spot averaging 0.4 degrees below normal. The cold spots were in Winner and Custer, both averaging 4.5 degrees below normal.
Precipitation in April was 20 to 30 percent below normal. The driest areas were across the plains of northeast Wyoming where precipitation averaged 40 to 60 percent of normal, and in southwestern South Dakota and the southern Black Hills were precipitation was 60 to 80 percent of normal. Across the northern and central Black Hills, the Bear Lodge Mountains and on the western South Dakota plains, precipitation was near normal. The wet spot was at Mission 14S where precipitation was 183 percent of normal, while Newell was the dry spot with only 28 percent of normal precipitation. The precipitation deficit for the month averaged 0.44 inches.
Snowfall in April was 15 to 25 percent above normal.  Snowfall averaged 2 to 3 feet across the northern Black Hills and Bear Lodge mountains.  On the northeast Wyoming plains snow averaged 4 to 8 inches with 6 to 12 inches on the plains of western South Dakota and in the southern and central Black Hills.

April storm summary...

On April 5 and 6 and upper level low pressure system moved across the central portions of western South Dakota bringing a narrow band of 8 to 14 inches of snow to northern Butte and northern Meade counties. Elsewhere in northwest South Dakota, the northern Black Hills, the Bear Lodge Mountains and northern portions of Crook and Campbell counties in northeast Wyoming, 4 to 8 inches of snow fell. Elsewhere precipitation was light with little or no snow.

On April  10 and 11 a powerful upper level storm system moved through the central plains and brought 1 to 2 inches of precipitation to western South Dakota and portions of northeast Wyoming ...with heavy snow falling in some areas.  The northern Black Hills and Bear Lodge mountains saw 9 to 15 inches of snow with 8 to 14 inches of snow over south central South Dakota. Elsewhere on the plains of western South Dakota snowfall was 1 to 4 inches with little or no snow across the plains of northeast Wyoming.

On April 23 an upper level disturbance brought severe weather to southwestern and south central South Dakota. Large hail fell with these storms, ranging in size from pennies to golf balls.

LOCAL EXTREMES

Temperature Data Rapid City   Lead   Gillette  
  Temperature Date Temperature Date Temperature  Date
Maximum Temperature 85 degrees 15th 71 degrees 15th,  29th 77 degrees 29th
Minimum Temperature 10 degrees 1st 10 degrees 1st 8 degrees 1st
             
Precipitation Data Rapid City   Lead   Gillette  
Monthly  Data Amount Data Amount Date Amount Date
Precipitation 1.38 inches   3.47 inches   0.91 inches  
Snowfall 5.2 inches   34.8 inches   7.4 inches  
             
Daily Data            
Maximum Precipitation 0.52 inches 11th 0.85 inches 11th 0.52 inches 10th
Maximum Snowfall 2.2 inches 7th 8.0 inches 11th 3.5 inches 10th

 

REGIONAL EXTREMES

Temperature Data   Western South Dakota     Northeastern Wyoming  
  Temperature Site Date Temperature Site Date
Maximum Temperature 91 degrees Midland 15th        81 degrees       
81 degrees
  Devils Tower    Newcastle        15th         10th
Minimum Temperature -3 degrees Hill City 1st 5 degrees Dillinger 1st
             
Precipitation Data   Western South Dakota     Northeastern Wyoming  
Monthly Data Amount Site Date Amount Site Date
Maximum Precipitation 3.89 inches Mission 14S   1.98 inches Hulett  
Minimum Precipitation 0.47 inches Newell   0.58 inches Dillinger  
Maximum Snowfall 34.8 inches Lead   12.0 inches Upton 14ENE  
Minimum Snowfall 0.6 inches Cottonwood 2E   2.0 inches Devils Tower  
             
Daily Data            
Maximum Precipitation 1.98 inches Mission 14S 24th       0.52 inches        0.52 inches          Colony            Gillette 4SE         5th          10th 
Maximum Snowfall 14.0 inches Hoover 6th 5.0 inches Rockypoint 1N 6th

 

MONTHLY RECORDS

LOCATION DATE NEW RECORD OLD RECORD DATE
Faith 04/06/2008 12.8 inches snowfall 11.2 inches snowfall 04/18/1970



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