December 2008 Climatic Summary

December was a cold month with temperatures averaging 6 to 7 degrees below normal. All reporting locations had below normal temperatures in December. Gillette 4SE in northeast Wyoming was the warm spot averaging 3.4 degrees below normal. The cold spot was Wright 12W in northeast Wyoming where temperatures averaged 7.8 degrees below normal.
Precipitation in December was 20 to 40 percent above normal. The wettest areas were across northwest and central South Dakota where precipitation averaged 200 to 300 percent of normal. The driest areas were across the plains of northeast Wyoming and over southwestern South Dakota where precipitation was 50 to80 percent of normal. The wet spot was in Hoover where precipitation was 316 percent of normal, while Upton in northeast Wyoming was the dry spot with only 15 percent of normal precipitation. The precipitation surplus for the month averaged 0.17 inches. 
Snowfall in December was 40 to 60 percent above normal. Snowfall averaged 1 1/2 to 3 feet across the northern Black Hills and Bear Lodge mountains.  On the northeast Wyoming plains snow averaged 6 to 12 inches. In western South Dakota snow fall was 10 to 20 inches across northwest South Dakota and 5 to 10 inches elsewhere on the plains of western South Dakota, and in the southern and central Black Hills.

December storm summary...

On December 2 and 3,  a weak upper level disturbance brought 1 to 3 inches of snow to the plains of western South Dakota and northeast Wyoming, with 3 to 6 inches in the Black Hills.
 
On December 8 and 9, an upper level disturbance brought upslope snows to the northern Black Hills where 5 to 8 inches of snow fell.
 
On December 11 through 14, a stronger upper level system brought 8 to 12 inches of snow to the northern Black Hills and 2 to 4 inches of snow elsewhere.
 
On December 14 through 16, bitter cold arctic air cover the region with highs near or below zero and may locations reporting 20 to 25 degrees below zero at night.
 
On December 22 and 23, a weak storm system brought a widespread 2 to 4 inches of snow to the region.
 
On December 26 and 27, another weak storm system brought an additional 2 to 4 inches of snow to northwest South Dakota.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

56 degrees

7th

49 degrees

7th

56 degrees

7th

Minimum Temperature

-19 degrees

15th

-22 degrees

15th

-20 degrees

15th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

0.37 inches

 

1.99 inches

 

0.79 inches

 

Snowfall

7.9 inches

 

33.8 inches

 

9.3 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.12 inches 

11th

0.44 inches

11th

0.30 inches

23rd

Maximum Snowfall

2.0 inches

2nd, 13th

5.8 inches

8th

2.0 inches

8th, 26th, 30th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

60 degrees

Porcupine 11N

8th

56 degrees

Gillette 4SE

7th

Minimum Temperature

-29 degrees

Oral

15th

-27 degrees

Devils Tower
Upton 14ENE

15th
15th, 16th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

2.23 inches

Deadwood 2NE

 

0.88 inches

Rockypoint 7NE

 

Minimum Precipitation

0.13 inches

Edgemont

 

0.30 inches

Newcastle

 

Maximum Snowfall

33.8 inches

Lead

 

14.1 inches

Upton 14ENE

 

Minimum Snowfall

3.7 inches

Edgemont

 

3.0 inches

Newcastle

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.59 inches

Deadwood 2NE

11th

0.30 inches

Gillette 4SE
Rockypoint 7NE

23rd
12th

Maximum Snowfall

10.0 inches

Shadehill Resv.

23rd

5.0 inches

Colony

25th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 

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