May 2008 Climatic Summary

  

May temperatures were well below normal, averaging 3 to 4 degrees below normal. Like April, all locations reported below normal temperatures. Gillette 4SE in northeastern Wyoming was the warm spot averaging 1.7 degrees below normal. The cold spot was in Winner where temperatures averaged 6.4 degrees below normal. The 54.2 degree average temperature in Winner made it the coldest May on record. The old record was 54.7 degrees in May of 1995.

May was one of the wettest on record...with precipitation averaging 175 to 300 percent of normal.  Southwestern and south central South Dakota saw near normal precipitation, while all other areas were well above normal. The wet spot was in Newell where precipitation was 347 percent of normal, while Winner was the dry spot with only 62 percent of normal precipitation. The precipitation surplus for the month averaged 3.02 inches.  Record May rainfalls were set at Fort Meade where 11.49 inches of rain fell, Newell with 9.37 inches, and at Maurine 10SW where 8.15 inches of rain fell.

May saw record setting snowfall across much of western South Dakota, the northern Black Hills and the Bear Lodge Mountains.  Snowfall averaged 3 to 5 feet across the northern Black Hills and Bear Lodge mountains, with 2 to 4 feet across Butte and Harding counties.  On the northeast Wyoming plains snow averaged 2 to 6 inches. The northern and eastern foothills saw 8 to 16 inches, with 2 to 6 inches falling elsewhere on the South Dakota plains, except for south central South Dakota where little or no snow fell. Record monthly snowfalls included Lead with 61.6 inches, Spearfish 24.0 inches, Camp Crook 24.0 inches, Devils Tower, Wyoming 15.0 inches, Redig 11N 15.0 inches and Maurine 10SW 12.0 inches.

 

May storm summary...

 

On May 1 through 3 and powerful upper level storm system brought a record setting blizzard to far western South Dakota and the Bear Lodge Mountains in northeastern Wyoming. Record May snowfalls of 2 to 4 feet fell across the northern Black Hills, Bear Lodge Mountains and over Harding and Butte counties in northwest South Dakota. Snowfall of 6 to 14 inches fell in far western Perkins and Meade counties, over the central Black Hills, and along the eastern foothills. On the plains of northeastern Wyoming and across southwestern South Dakota 1 to 4 inches of snow fell. Rain fell over the rest of the western South Dakota plains with most areas receiving 1 to 3 inches.

 

On May 6 through 10 a slow moving upper level trough brought cool temperatures and rain to the region. Most areas received 0.75 to 1.50 inches of rain. On May 6 large hail to the size of gold balls was reported in Todd and Tripp counties. On May 9 large hail to the size of nickels was reported in Weston county of northeastern Wyoming.

 

On May 22 through 27 a slow moving upper level trough brought cool temperatures...rain and some high elevation snows to the region.  Rainfall averaged 1.5 to 3.0 inches...with some locally heavier amounts near 4 inches in the eastern foothills. In the higher elevations of the Black Hills 3 to 6 inches of snow fell on May 26 and May 27. On May 24 severe weather was reported across central South Dakota with large hail reported in Todd...Mellette...Haakon...Perkins and Ziebach counties. The largest hail fell in Ziebach county where Tennis ball size hail was reported.  A small tornado touched down in Ziebach county near Eagle Butte.

 

On May 28 through May 31 scattered severe weather occurred each day. On May 28 isolated severe storms produced nickel size hail in Campbell county. On May 29 scattered severe storms produced nickel size hail in Bennett, Lawrence, Butte and Campbell counties. On May 30 isolated storms produced quarter size hail in Campbell county and penny size hail in Pennington county. On May 31 severe storms dropped hail to the size of quarters in the southern and central Black Hills and over southwestern South Dakota.

 LOCAL EXTREMES

 

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

85 degrees

18th

78 degrees

18th

80 degrees

20th

Minimum Temperature

26 degrees

3rd,  4th

19 degrees

3rd

22 degrees

3rd

 

 

 

 

 

 

 

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly  Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

7.24 inches

 

10.18 inches

 

7.30 inches

 

Snowfall

11.0 inches

 

61.6 inches

 

1.5 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

2.09 inches

22nd

39.2 inches

2nd

1.35 inches

23rd

Maximum Snowfall

11.0 inches

2nd

2.86 inches

2nd

1.5 inches

2nd


REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

90 degrees

Ardmore 2N    Oglala 1S

18th               19th

85 degrees

Newcastle

19th

Minimum Temperature

14 degrees

Hill City

3rd

10 degrees

Upton 14 ENE

3rd

 

 

 

 

 

 

 

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

11.49 inches

Fort Meade

 

7.34 inches

Dillinger

 

Minimum Precipitation

2.38 inches

Winner

 

4.48 inches

Newcastle

 

Maximum Snowfall

61.6 inches

Lead

 

22.0 inches

Upton 14 ENE

 

Minimum Snowfall

0.0 inches

Several Locations

 

Trace

Newcastle

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

4.05 inches

Ladner 9 SW

2nd

2.05 inches

Weston 1E

23rd

Maximum Snowfall

39.2 inches

Lead

2nd

13.5 inches

Devils Tower

2nd

 MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Camp Crook

May

24.0 inches snowfall

23.0 inches snowfall

1950

Camp Crook

05/01/2008

20.0 inches snowfall

12.0 inches snowfall

05/11/1943

Devils Tower, WY

May

15.0 inches snowfall

8.0 inches snowfall

1950

Devils Tower, WY

05/02/2008

13.5 inches snowfall

8.0 inches snowfall

05/09/1965

Fort Meade

May

11.49 inches rainfall

11.20 inches rainfall

1962

Fort Meade

05/02/2008

12.0 inches snowfall

10.0 inches snowfall

05/09/1965

Hot Springs

05/02/2008

8.0 inches snowfall

5.0 inches snowfall

05/12/2005

Lead

May

61.6 inches snowfall

37.5 inches snowfall

1965

Lead

05/02/2008

39.2 inches snowfall

25.0 inches snowfall

05/09/1965

Maurine 12 SW

May

8.15 inches rainfall

7.21 inches rainfall

1995

Maurine 12 SW

May

12.0 inches snowfall

4.0 inches snowfall

2005,   1991

Maurine 12 SW

05/02/2008

2.55 inches rainfall

1.94 inches rainfall 

05/06/2007

Maurine 12 SW

05/02/2008

6.0 inches snowfall

4.0 inches snowfall

05/03/1991

Newell

May

9.37 inches rainfall

8.60 inches rainfall

1962

Rapid City Airport

05/02/2008

11.0 inches snowfall

7.5 inches snowfall

05/11/2005

Redig 11N

May

15.0 inches snowfall

10.5 inches snowfall 

1950

Redig 11N

05/02/2008

10.0 inches snowfall

8.0 inches snowfall

05/12/2005

Spearfish

May

24.0 inches snowfall

10.5 inches snowfall 

1950

Spearfish

05/03/2008

14.0 inches snowfall

9.0 inches snowfall

05/01/1967

Winner

May

54.2 degree avg. temperature

54.7 degree avg temperature

1995

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