May 2006 Climatic Summary

The first two weeks of May were cool and mainly dry, except for a storm system that moved through the area from May 8 through May 11. The most significant precipitation with this storm fell in northeastern Wyoming and the Black Hills, with lighter amounts on the South Dakota plains. It was cold enough for 5 to 10 inches of snow in the Black Hills and Bear Lodge Mountains and 1 to 4 inches of snow across portions of the northeastern Wyoming Plains.

Warmer weather arrived on May 16 and continued through May 27. Isolated severe weather was reported in northeastern Wyoming on May 20 and May 22. The South Dakota plains saw a few severe thunderstorms on May 26. An upper level storm system dominated the weather from May 28 through May 31 bringing cooler than normal temperatures and scattered thunderstorms. A significant severe weather event struck the plains of South Dakota on the evening of May 29 with numerous reports of large hail and thunderstorm wind damage. Isolated severe weather was reported in northeastern Wyoming on May 30 and on the plains of South Dakota on May 31.

Temperatures averaged 1.5 to 3.0 degrees above normal in May. Wood was the only location to record below normal temperatures. Averages ranged from 6.3 degrees above normal at Camp Crook to 0.4 degrees below normal at Wood.

May was a very dry month across the plains of western South Dakota, with rainfall only 25 to 50 percent of normal. A few locations received less than 10 percent of the normal rainfall. Across northeastern Wyoming and the Black Hills near normal precipitation fell, with locations receiving 80 to 100 percent of normal rainfall. The Bear Lodge Mountains of northeastern Wyoming were the only area to receive above normal precipitation, with rainfall averaging 120 to 150 percent of normal. Precipitation ranged from 166 percent of normal at Upton in northeastern Wyoming to only 3 percent of normal at Wood and 7 percent of normal in Winner.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

95 degrees

22nd, 26th

84 degrees

22nd

86 degrees

26th

Minimum Temperature

32 degrees

5th, 6th

27 degrees

4th, 5th

24 degrees

4th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly  Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

1.68 inches

 

4.01 inches

 

2.83 inches

 

Snowfall

0.0 inches

 

14.0 inches

 

4.2 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.51 inches

9th

0.97 inches

29th

1.55 inches

24th

Maximum Snowfall

0.0 inches

 

9.9 inches

9th

4.2 inches

9th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

101 degrees

Maurine 10SW

27th

93 degrees

Colony

26th

Minimum Temperature

19 degrees

Ladner

5th

19 degrees

Moorcroft

4th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

4.54 inches

Deadwood 2NE

 

4.90 inches

Upton 14ENE

 

Minimum Precipitation

0.11 inches

W ood

 

0.78 inches

Colony

 

Maximum Snowfall

14.0 inches

Lead

 

6.0 inches
6.0 inches

Upton 14ENE    Upton

 

Minimum Snowfall

0.0 inches

Several Locations

 

0.0 inches

Several Locations

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.50 inches

Ludlow

29th

2.26 inches

Rockypoint 1N

24th

Maximum Snowfall

9.9 inches

Lead

9th

6.0 inches

Upton

9th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Maurine 10SW

March

101 Degrees

96 degrees

1992

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