April 2009 Climatic Summary

April temperatures were cool, averaging 2 to 4 degrees below normal. All stations reported below normal temperatures. Sundance in northeast Wyoming was the warm
spot averaging 0.5 degrees below normal. The cold spot was at Colony, in northeast Wyoming, where temperatures averaged 7.6 degrees below normal.
Precipitation in April average 20 to 30 percent above normal. The wettest areas were across the Southern and Central Black Hills and in southwestern South Dakota where precipitation averaged 150 to 200 percent of normal. The driest areas were across northwestern South Dakota where precipitation was 50 to 75 percent of normal. The wet spot was at the Mount Rushmore National Memorial where precipitation was 248 percent of normal. Kirley 6N was the dry spot with only 38 percent of normal precipitation. The precipitation surplus for the month averaged 0.50 inches.
April was another snowy month, with snowfall averaging 230 to 250 percent of normal. Snowfall averaged 20 to 30 inches across the northern Black Hills and Bear Lodge mountains. In the southern and central Black Hills snowfall averaged 15 to 25 inches. On the northeast Wyoming plains snowfall averaged 5 to 12 inches. Across the south central South Dakota plains snowfall averaged 12 to 24 inches, with 6 to 12 inches elsewhere on the plains of western South Dakota.

April storm summary...

On April 3 and 4…the third blizzard in 2 weeks struck western South Dakota and northeast Wyoming with 8 to 15 inches of snow falling over most of the area. Snowfall
amounts of 4 to 8 inches were reported across southwest South Dakota, the southern Black Hills and across Weston County and southern Campbell County in northeast Wyoming. Winds of 25 to 35 mph were reported with gusts to near 45 mph.
 
On April 15…an upper level storm system brought rain to western South Dakota and snow to northeast Wyoming. Across the Bear Lodge Mountains 3 to 6 inches of snow
fell with 1 to 3 inches across the plains of northeast Wyoming. The central and southern plains of western South Dakota saw 0.25 to 0.50 inches of rain, with little or no rain falling in northwest South Dakota.
 
On April 25…a storm system moving through the Central Plains brought 4 to 8 inches of snow to far western South Dakota and the Bear Lodge mountains, and 2 to 4 inches of
snow to the plains of northeast Wyoming.

 
LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

85 degrees

23rd

75 degrees

23rd

78 degrees

22nd

Minimum Temperature

6 degrees

6th

10 degrees

6th

8 degrees

6th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

3.65 inches

 

2.95 inches

 

1.68 inches

 

Snowfall

21.9 inches

 

27.1 inches

 

6.6 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.04 inches

4th

0.72 inches

4th

0.50 inches

26th

Maximum Snowfall

12.4 inches

4th

11.7 inches

4th

3.0 inches

4th, 26th


REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

91 degrees

Winner

24th

83 degrees

Devils Tower Newcastle

24th

Minimum Temperature

2 degrees

Hoover

6th

1 degree

Hulett

6th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

5.47 inches

Mt. Rushmore

 

3.08 inches

Dillinger

 

Minimum Precipitation

0.72 inches

Kirley 6N

 

1.09 inches

Colony

 

Maximum Snowfall

30.4 inches

NWS Rapid City

 

28.0 inches

Rockypoint 7NE

 

Minimum Snowfall

3.1 inches

Milesville 5NE

 

3.0 inches

Newcastle

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.35 inches

Winner

5th

1.03 inches

Devils Tower

26th

Maximum Snowfall

13.9 inches

WFO Rapid City

4th

7.0 inches

Sundance

4th


MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Long Valley

04/04/2009

12.0 inches snowfall

12.0 inches snowfall

04/11/1995

Maurine 12Sw

04/04/2009

10.0 inches snowfall

8.0 inches snowfall

04/01/1999

  
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