April 2012 Climatic Summary
 
April temperatures were well above average across much of the area this month. The average monthly temperature was over 5 degrees above normal across the region. The location with the greatest departure in April was the National Weather Service Office in Rapid City, with an average temperature of 6.6 degrees above normal.
 
Precipitation in April averaged around 114 percent of normal across the entire area.  Only the Newcastle, Wyoming area was well below average for precipitation. Many locations across the central South Dakota plains received 120 to 160 percent of normal rainfall. With the well above average temperatures, snowfall was very sparse, with most locations having no report or only a trace of snow. A few higher elevation locations received some snow in April. Lead reported 12 inches, Wright 12W reported 5.8 inches, Sundance reported 1.5 inches, and Pactola Reservoir reported 0.5 inches of snow.
 
April storm summary...
 
April 1st-2nd  – A fast moving cold front brought very windy conditions to much of South Dakota. Winds gusted to 60 mph behind the cold front as it crossed the state.
 
April 6th – A strong low pressure system moved out of the Rockies and into the northern plains. This system produced showers and thunderstorms with nickel to quarter sized hail and 50 to 70 mph wind gusts across the Black Hills area northwestern South Dakota.
 
April 12th – A vigorous low pressure system in southern Montana brought very gusty southwesterly winds to much of northeast Wyoming. Wind gusts of 40 to 60 mph were common across the area.

April 15th – A strong storm system dumped up to a foot of snow across the higher elevations of the northern Black Hills, 0.50 to 2.00 inches of rain across the plains, and produced 50 to 60 mph winds across south central South Dakota.

LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
86
1st
79
24th
84
23rd
Min. Temp.
29
11th
24
7th
17
8th
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
2.22
 
3.60
 
2.00
 
Snowfall
T
 
12.0
 
T
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
0.61
27th
1.50
15th
0.45
14th
Max. Snowfall
T
14th
7.5
15th
T
Several Dates

 

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