April 2007 Climatic Summary

The first day of April saw seasonal temperatures before a large upper level trough moved into the northern plains bringing below normal temperatures and light precipitation to the region from April 2 through April 13. Weak upper level disturbances moved through the region during this time period bringing periods of light rain and snow. On the plains of western South Dakota and northeastern Wyoming 1 to 3 inches of snow fell during this time period with 8 to 14 inches falling in the northern Black Hills. Above normal temperatures retuned on April 14 and continued through the end of the month. An upper level storm system brought 0.25 to 0.75 inches of rain to the region on April 18 and 19. Thunderstorms moved across northeastern Wyoming on April 18 producing large hail over northeastern Wyoming. On April 21 another round of thunderstorms moved across the region with large hail being reported on the central and south central plains of South Dakota. April 24 through 27 saw scattered showers across the region before dry weather returned for April 28 through April 30.
Temperatures in April were near normal with most sites between 1.5 degrees below normal and 1.5 degree above normal. Averages ranged from 1.7 degrees above normal at Gillette 4SE to 4.3 degrees below normal at Winner.
April was a very dry month, with only 5 locations reporting above normal precipitation. Overall precipitation averaged 60 to 80 percent of normal. Precipitation ranged from 119 percent of normal at Upton in northeastern Wyoming to 20 percent of normal in Spearfish where only 0.49 inches of rainfall fell. The rainfall deficit for the month averaged 0.65 inches.
Snowfall was well below normal in the month of April. In the northern Black Hills and Bear Lodge mountains snowfall averaged 10 to 24 inches. On the plains of western South Dakota and northeastern Wyoming snowfall was generally 2 to 6 inches.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

83 degrees

28th

74 degrees

28th 

78 degrees

28th, 29th, 30th

Minimum Temperature

6 degrees

6th

-1 degrees

7th

13 degrees

6th, 7th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

1.32 inches

 

1.96 inches

 

0.75 inches

 

Snowfall

1.6 inches

 

12.4 inches

 

0.0 inhces

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.58 inches

19th

0.53 inches

11th

.30 inches

19th

Maximum Snowfall

0.9 inhces

5th

6.1 inches

11th

0.0 inches

 

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

85 degrees

Maurine 10 SW

29th

84 degrees

Devil's Tower

30th

Minimum Temperature

-2 degrees

Custer        Medicine Mtn

7th                     6th

-2 degrees

Sundance

7th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

2.93 inches

Winner

 

1.85 inches

Upton

 

Minimum Precipitation

0.49 inches

Spearfish

 

0.61 inches

Hulett

 

Maximum Snowfall

12.4 inches

Lead

 

3.4 inches

Wright 12W

 

Minimum Snowfall

0.0 inhces

Wasta

 

0.0 inches

Several Locations

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.39 inches

Winner

22nd

0.65 inches

Moorcroft

20th

Maximum Snowfall

6.1 inches

Lead

11th

1.7 inches

Wright 12W

5th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 

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