December 2012 Climatic Summary
 
December temperatures generally ranged from 1 degree below average to 3 degrees above average across the area this month. The average monthly temperature was 1.2 degrees above normal across the entire region. The location with the highest departure in December was Winner, with an average temperature of 4.7 degrees above normal. Newell had the coolest departure, at 1.9 degrees below average.
 
Precipitation in December averaged 78 percent of normal across the entire area. The locations that had above normal precipitation were Custer, Dupree, Hot Springs, Milesville, and Newell. The driest location was Wright 12W, with only 0.12 inches of precipitation. On the other end of the spectrum, Lead had 0.94 inches of precipitation for the month.
 
Snowfall for December averaged 98 percent of normal across the entire area. Most locations reported between 3 and 6 inches of snowfall for the month. The highest December snow totals occurred over the Bear Lodge Mountains and the Northern Black Hills. Sundance received 10.2 inches of snow, Devil’s Tower reported 13.5 inches, and Lead received 18.2 inches of snow for the month. The largest departure from normal snowfall occurred at Newell, where 9.0 inches of snow fell. This was nearly twice their average for December.
 
December significant storm summary...
 
December 2nd – A strong pressure gradient brought very gusty winds to parts of Northeast Wyoming and the Black Hills of South Dakota. Many locations reported 40 to 60 mph wind gusts. A few locations in Northeast Wyoming had wind gusts close to 70 mph.
 
December 7th – A weak weather system brought up to a couple of inches of snow to parts of western South Dakota. A narrow band of snow set up during the morning hours over parts of Meade and Butte counties. A few locations reported more than 6 inches of snow.
 
December 25th – A strong area of low pressure moved out of Colorado and into the plains Christmas Eve and on Christmas. A white Christmas was observed for most locations, as widespread light snow fell across the area. Snowfall totals ranged from an inch up to 5 inches.
 
LOCAL EXTREMES
Rapid City
Lead
Gillette
Temperature
Temperature
Date
Temperature
Date
Temperature
Date
Max. Temp.
66
2nd
55
1st, 2nd
58
1st, 2nd
Min. Temp.
-1
9th, 10th, 26th
-4
9th
-5
31st
Precipitation
Rapid City
Lead
Gillette
Monthly Data
Amount
Date
Amount
Date
Amount
Date
Precipitation
0.22
 
0.94
 
0.28
 
Snowfall
5.6
 
18.2
 
3.6
 
Daily Data
Amount
Date
Amount
Date
Amount
Date
Max. Precipitation
0.09
9th
0.22
7th
0.13
27th
Max. Snowfall
2.8
9th
4.0
9th
2.0
27th

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