APRIL 2006 CLIMATIC SUMMARY

The first week of April was mild and dry. On April 6 and April 7 a storm system brought snow to the Black Hills, and portions of northeastern Wyoming and southwestern South Dakota. The Black Hills and Bear Lodge Mountains saw 6 to 10 inches of snow while areas on the plains generally saw 4 inches or less. Dry and very warm conditions occurred from April 8 through April 17, with many areas seeing several days of high temperatures in the 80s.

A powerful upper level low pressure system moved across western South Dakota from April 18 through April 20. This storm dropped tremendous amounts of snow across northwestern South Dakota and in the Northern Black Hills and the Bear Lodge Mountains. Snowfalls of 10 to 24 inches were reported in northwestern South Dakota with 16 to 30 inches in the Bear Lodge Mountains and 40 to 70 inches in the northern Black Hills. Lead reported 74 inches of snow and Deadwood reported 55 inches of snow during this 3 day storm. Elsewhere on the plains of northeastern Wyoming and western South Dakota snowfall was 6 inches or less, with rain falling across southwestern and south central South Dakota. After a brief warm-up, yet another snowstorm moved across the region on April 24 with 5 to 10 inches of snow falling across far western South Dakota and the Black Hills with lesser amounts in northeastern Wyoming. The last 5 days of April saw seasonal temperatures and mainly dry weather.

Temperatures averaged 3 to 5 degrees above normal in April. All locations reported above normal temperatures for the month. Averages ranged from 1.6 degrees above normal at Devils Tower in northeastern Wyoming to 6.9 degrees above normal at Maurine 10SW.

April as a whole was a wet month across South Dakota. In northeastern Wyoming conditions were drier than normal except across the Bear Lodge Mountains where above normal precipitation fell. Around the Bear Lodge Mountains precipitation averaged 40 to 80 percent above normal, while on the plains of northeastern Wyoming precipitation was 60 to 80 percent of normal. Precipitation averaged 200 to 250 percent of normal across northwestern South Dakota and the northern Black Hills. Elsewhere on the plains of western South Dakota, precipitation was 80 to 120 percent of normal. Precipitation ranged from 406 percent of normal at Ladner 9SW to 53 percent of normal at Glad Valley 2W.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

80 degrees

5th, 13th, 14th

72 degrees

5th

76 degrees

5th, 13th, 14th

Minimum Temperature

26 degrees

7th

17 degrees

25th

18 degrees

25th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly  Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

2.29 inches

 

9.00 inches

 

1.15 inches

 

Snowfall

6.6 inches

 

82.7 inches

 

5.0 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.83 inches

6th

3.75 inches

19th

0.37 inches

24th

Maximum Snowfall

4.8 inches

24th

44.5 inches

19th

5.0 inches

24th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

89

Winner

11th, 13th

81 degrees

Newcastle

6th

Minimum Temperature

16 degrees

Medicine  Mtn.

8th, 25th

16 degrees

Dillinger

25th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

9.00 inches

Lead

 

4.36 inches

Sundance

 

Minimum Precipitation

1.06 inches

Glad Valley

 

0.88 inches

Moorcroft

 

Maximum Snowfall

82.7 inches

Lead

 

40.0 inches

Sundance

 

Minimum Snowfall

Trace

Lemmon

 

2.0 inches

Moorcroft   Echeta  2NW

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

3.75 inches

Lead

19th

1.88 inches
1.88 inches

Newcastle
Sundance

19th
19th  

Maximum Snowfall

44.5 inches

Lead

19th

18.0 inches
18.0 inches

Sundance
Newcastle

18th
19th 

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Lead

April

9.00 inches rainfall

7.82 inches

1918

Lead

4/19/2006

3.75 inches rainfall

2.95 inches

4/18/1918

Lead

4/19/2006

44.5 inches snowfall

35.2 inches

4/26/1994

Newcastle, Wyoming

April

25.0 inches snowfall

20.5 inches

1927

Newcastle, Wyoming

4/19/2006

18.0 inches snowfall  (all-time)

16.0 inches

3/12/1952

Newcastle, Wyoming

4/19/2006

18.0 inches snowfall

8.0 inches

4/8/1975

Newell

April

4.25 inches rainfall

3.57 inches rainfall

1986

Redig

4/19/2006

20. inches snowfall  (all-time)

17.0 inches snowfall

4/26/1994

Redig

4/19/2006

20.0 inches snowfall

17.0 inches snowfall

4/26/1994

Redig

4/19/2006

1.80 inches rainfall

1.74 inches rainfall

4/19/1971

Sundance, Wyoming

April

40.0 inches snowfall

40.0 inches snowfall

1984

Sundance, Wyoming

4/19/2006

1.88 inches rainfall

1.82 inches rainfall

4/6/1997

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