December 2011 Climatic Summary 

December temperatures were very warm, with temperatures averaging around 5 degrees above normal. The area with the greatest departure from normal was northwest South Dakota, where temperatures ranged from 6 to 9 degrees above normal. The coolest area was in the Black Hills into northeast Wyoming, where temperatures were around 1 degree below to 4 degrees above normal. The coolest location was Wright 12W in northeast Wyoming which was 1.1 degrees below normal, while the warmest location was Dupree in northwest South Dakota with 8.9 degrees above normal.
 
Precipitation in December averaged around 75 percent of normal across the entire area.  The wettest areas were over the central and northern Black Hills into portions of northeast Wyoming and far northwest South Dakota, where amounts of around 100 to 150 percent of normal were reported. The driest areas were over west central into south central South Dakota where amounts of around 25 to 75 percent of normal were reported. The wettest location was Camp Crook with 180 percent of normal, and the driest was Redig, where only a trace of precipitation was reported. Snowfall was the heaviest over the northern Black Hills into the Bear Lodge Mountains where 1 to near 3 feet of snow fell. Lead reported 33.5 inches of snow this month.
 
December storm summary... 

December 1st  – Upslope enhanced snowfall occurred over the northern Black Hills into the Bear Lodge Mountains, bringing multiple reports of over 6” snowfall.   The heaviest snow was in the Deadwood area, where 11” was reported.

December 31st – Strong west to northwesterly winds developed behind a strong cold front moving through the region. No damage was reported.

LOCAL EXTREMES Rapid City Lead Gillette
Temperature Temperature Date Temperature Date Temperature Date
Max. Temp. 61 degrees 18th 57 degrees 18th 52 degrees 18th
Min. Temp. -4 degrees 6th -4 degrees 4th & 5th -3 degrees 6th
Precipitation Rapid City Lead Gillette
Monthly Data Amount Date Amount Date Amount Date
Precipitation 0.29 inches   2.13 inches   1.1 inches  
Snowfall 3.0 inches   33.5 inches   6 inches  
Daily Data Amount Date Amount Date Amount Date
Max. Precipitation 0.12 inches 21st 0.53 inches 1st 0.42 inches 1st
Max. Snowfall 1.1 inches 1st 10.5 inches 1st 2 inches 4th & 31st
             
REGIONAL EXTREMES Western South Dakota Northeast Wyoming
Temperature Temperature Site Date Temperature Site Date
Max. Temp. 63 degrees Midland 23rd 60 degrees Colony 18th
Min. Temp. -15 degrees Lodgepole 9th -8 degrees Dillinger 6th
Precipitation Western South Dakota Northeast Wyoming
Monthly Data Amount Site Date Amount Site Date
Max. Precipitation 2.13 inches Lead   0.71 inches Devils Tower  
Min. Precipitation 0.00 inches Reddig 11 NE   0.07 inches Colony  
Max. Snowfall 33.5 inches Lead   8 inches Upton 14 ENE  
Min. Snowfall 0.0 inches Reddig 11 NE   1 inch Colony  
Daily Data Amount Site Date Amount Site Date
Max. Precipitation 0.53 inches Lead 1st 0.42 inches Gillette 1st
Max. Snowfall 10.5 inches Lead 1st 3.1 inches Wright 12 W 21st

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