February 2009 Climatic Summary

February temperatures were warm, averaging 2 to 4 degrees above normal. Gillette 4SE in northeast Wyoming was the warm spot averaging 5.2 degrees above normal. The
cold spot was in Bison where temperatures averaged 2.2 degrees below normal. 
February was a wet month with precipitation averaging 70 to 90 percent above normal. The wettest areas were across the plains of northwest, central and south central South Dakota where precipitation averaged 200 to 400 percent of normal. The driest areas were across southwestern South Dakota and in Weston County in northeast Wyoming, where precipitation averaged 40 to 80 percent of normal. The wet spot was in Hoover, where precipitation was 470 percent of normal. Upton in northeast Wyoming was the dry spot with only 16 percent of normal precipitation. The precipitation surplus for the month averaged 0.37 inches.
Snowfall in February was 40 to 50 percent above normal. Snowfall averaged 12 to 24 inches across the northern Black Hills and Bear Lodge mountains. On the northeast Wyoming plains snowfall averaged 6 to 12 inches. Across the northwestern South Dakota plains snowfall averaged 10 to 20 inches, with 5 to 10 inches elsewhere on the plains of western South Dakota and in the southern and central Black Hills.
 

February storm summary...

February 9 and 10…a strong low pressure system moved through eastern South Dakota and dropped 3 to 6 inches of snow across northwest South Dakota and the northern Black Hills. February 12 and 13…an upper level storm system brought 2 to 5 inches of snow to southwest South Dakota…the southern Black Hills and over southern Campbell County and Weston County in northeast Wyoming.

February 20…an upper level disturbance brought 3 to 6 inches of snow to the northern Black Hills and 1 to 2 inches of snow elsewhere across western South Dakota and northeast Wyoming.
 
February 26…a strong upper level disturbance brought 8 to 15 inches of snow to Harding and Perkins counties in northwest South Dakota. The heaviest snow fell at Prairie City in Perkins County where 15 inches fell. Across Butte, Lawrence, Meade, Ziebach and Pennington counties 2 to 5 inches of snow fell. In northeast Wyoming 5 to 10 inches of snow fell across northern Crook county.
 
February 27…a quick moving upper level disturbance brought 3 to 6 inches of snow to northwest South Dakota and south central South Dakota. Elsewhere in western South Dakota 1 to 3 inches of snow fell. Across northeast Wyoming 2 to 5 inches fell in northern Crook and Campbell counties…with an inch or less elsewhere in northeast Wyoming.

 LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

63 degrees

24th

60 degrees

4th

59 degrees

23rd

Minimum Temperature

-9 degrees

28th

1 degree

27th

5 degrees

21st

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

0.77 inches

 

1.73 inches

 

0.29 inches

 

Snowfall

4.5 inches

 

22.5 inches

 

1.3 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.37 inches

9th

0.72 inches

9th

0.15 inches

26th

Maximum Snowfall

2.0 inches

13th

6.1 inches

9th

1.0 inches

9th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

 Maximum Temperature

69 degrees

Cedar Butte
Wood

25th                  25th

62 degrees

Colony

4th

Minimum Temperature

-19 degrees

Glad Valley

28th

-9 degrees

Weston

28th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

2.03 inches

Glad Valley

 

1.15 inches

Devils Tower
Hulett

 

Minimum Precipitation

0.10 inches

Ardmore 2N

 

0.07 inches

Upton

 

Maximum Snowfall

33.6 inches

Shadehill Reservoir

 

13.4 inches

Devils Tower  

 

Minimum Snowfall

2.8 inches

Interior 3NE

 

1.3 inches

Gillette 4SE

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.32 inches

Long Valley

9th

0.77 inches

Hulett

26th

Maximum Snowfall

16.0 inches

Shadehill Reservoir

26th

9.5 inches

Colony

26th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Bison

February

22.1 inches snowfall

17.0 inches snowfall

1952

Bison

02/26/2009

10.0 inches snowfall

7.0 inches snowfall

02/26/1998

Colony, Wy.

02/26/2009

9.5 inches snowfall

8.0 inches snowfall

02/17/1991

Lemmon

02/10/2009

0.70 inches rainfall

0.68 inches rainfall 

02/21/1975

Long Valley

February

2.01 inches rainfall

1.88 inches rainfall

1987

Long Valley

02/09/2009

1.32 inches rainfall

0.90 inches rainfall

02/18/1991

 

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