September 2010 Climatic Summary

September temperatures were near normal, averaging from 0.5 degrees below normal to 0.5 degrees above normal. Spearfish was the warm spot averaging 4.1 degrees above normal. The cold spot was in Winner where temperatures averaged 4.3 degrees below normal.
Precipitation in September average 15 to 30 percent above normal. The wettest areas were across the northwest and north central portions of western South Dakota where precipitation averaged 200 to 300 percent of normal. The driest areas were across northeast Wyoming and the northern Black Hills where precipitation averaged 20 to 40 percent of normal. The wet spot was at Redig 11NE where precipitation was 343 percent of normal. Dillinger and Gillette 4SE in northeastern Wyoming were the dry spots with only 18 percent of normal precipitation. The precipitation surplus for the month averaged 0.23 inches.
No snowfall was reported in September.


September storm summary...

On September 5…An isolated severe thunderstorm moved through Harding County producing 68 mph winds at Buffalo and tennis ball size hail 3 miles south of Redig. The storm also dropped 1.50 inches of rain 15 miles northeast of Redig with pea size hail covering the ground. 

On September 9…An isolated severe thunderstorm produced quarter size hail and 60 mph winds 7 miles southeast of Hermosa, and 1.48 inches of rain 1 mile west of Hermosa in Custer County. Another severe thunderstorm produced 69 mph winds at Faith in northern Meade County.
 
On September 15…An isolated severe thunderstorm produced golf ball size hail in Wasta in Pennington County.
 
On September 22…An isolated severe thunderstorm produced quarter size hail in Colome in Tripp County.


LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

92 degrees 

9th

83 degrees

26th, 27th,
28th

92 degrees

26th

Minimum Temperature

36 degrees

18th

30 degrees

18th

32 degrees

7th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

1.51 inches

 

0.65 inches

 

0.26 inches

 

Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.75 inches

9th

0.40 inches

23rd

0.13 inches

23rd

Maximum Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 


REGIONAL EXTREMES 

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

98 degrees

Cedar Butte 1NE

21st

92 degrees

Several Locations

 

Minimum Temperature

27 degrees

Hill City

7th

28 degrees

Dillinger

7th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

3.95 inches

Kirley 6N

 

0.86

Sundance

 

Minimum Precipitation

0.24 inches

Edgemont

 

0.20

Dillinger

 

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

Minimum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.97 inches

Milesville 5NE

15th

0.45 inches

Weston 1E

15th

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 


MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 


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