January 2009 Climatic Summary

 
January temperatures were warm, averaging 2 to 4 degrees above normal. Sundance in northeast Wyoming was the warm spot averaging 6.3 degrees above normal. The
cold spot was in Winner where temperatures averaged 1.5 degrees below normal.
Precipitation in January average 10 to 20 percent above normal. The wettest areas were across the Black Hills and Bear Lodge Mountains where precipitation averaged 150 to 200 percent of normal. The driest areas were across northwestern South Dakota where precipitation was 25 to 50 percent of normal. The wet spot was at Newcastle in northeast Wyoming, where precipitation was 241 percent of normal. Kirley 6N and Ludlow 3SSE were the dry spots with only 5 percent of normal precipitation. The precipitation surplus for the month averaged 0.10 inches.
Snowfall in January was 20 to 40 percent above normal. Snowfall averaged 18 to 36 inches across the northern Black Hills and Bear Lodge mountains.  On the northeast Wyoming plains snowfall averaged 3 to 8 inches. Across the southwestern South Dakota plains snowfall averaged 6 to 15 inches, with 2 to 6 inches elsewhere on the plains of western South Dakota and in the southern and central Black Hills.

January storm summary...

January 9…Strong northwest winds developed behind a cold front and produced winds of 50 to 60 mph across northwest and west central South Dakota. The highest wind gust reported was 65 mph 4 miles northeast of Whitewood in Lawrence county.
 
January 12…A tight pressure gradient over western South Dakota produced strong winds across the western South Dakota plains. Wind gusts of 60 to 70 mph were common. The highest winds gusts were 82 mph in Newell and 77 mph in downtown Rapid City.
 
January 13…Strong downslope winds developed over the northern and eastern foothills. Winds gusted to 70 mph 4 miles southeast of Folsom in Custer county, 68 mph at Ellsworth AFB and to 67 mph in downtown Rapid City.
 
January 14 and 15…A strong cold front pushed across the area producing upslope snows over the northern Black Hills and northern foothills. In the northern Black Hills 6 to 12 inches of snow fell, with 3 to 6 inches over the northern foothills.
 
January 17 and 18…A strong pressure gradient behind a cold front produced strong northwest winds across northwest and west central South Dakota. Wind gusts of 55 to 65 mph were common. The highest wind gusts were 72 mph in downtown Rapid City, 63 mph in Buffalo and 61 mph at Ellsworth AFB.
 
January 23 through 26…A slow moving storm system in the central plains produced 6 to 12 inches of snow across southwestern South Dakota and in the southern Black Hills, 3 to 6 inches of snow in south central South Dakota, and 2 to 5 inches of snow over southern Campbell county and in Weston county in northeast Wyoming.  The heaviest snows fell at Oglala 1S with 13.2 inches and at Ardmore 2N where 12 inches of snow were reported.

January 31…Strong northwest winds behind a cold front brought wind gusts of 50 to 60 mph across northwest South Dakota.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

64 degrees

20th

59 degrees

21st

53 degrees

20th

Minimum Temperature

-15 degrees

27th

-8 degrees

27th

-16 degrees

27th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

0.37 inches

 

2.22 inches

 

0.70 inches

 

Snowfall

7.7 inches

 

29.6 inches

 

11.5 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.10 inches

7th, 25th

8.2 inches

14th

0.20 inches

7th

Maximum Snowfall

1.9 inches

14th

0.40 inches

14th

3.0 inches

7th

REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

66 degrees

Several locations

20th, 21st, 22nd

58 degrees

Wright 12W

21st

Minimum Temperature

-32 degrees

Ardmore 2N

27th

-24 degrees

Dillinger

27th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

2.22 inches

Lead

 

1.25 inches

Upton 14ENE

 

Minimum Precipitation

Trace

Harding 3SE

 

0.15 inches

Colony

 

Maximum Snowfall

29.6 inches

Lead

 

18.7 inches

Upton 14ENE

 

Minimum Snowfall

0.2 inches

Milesville 5NE

 

2.0 inches

Colony

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.40 inches

Lead

14th

0.45 inches

Upton  

7th

Maximum Snowfall

8.6 inches

Oglala 1S

26th

5.0 inches

Upton 14ENE

8th

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD 

DATE

 

 

NO RECORDS SET

 

 

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