January 2011 Climatic Summary

January temperatures were near normal, averaging from 2 degrees above normal to 2 degrees below normal. Gillette 4SE in northeast Wyoming was the warm spot averaging 2.3 degrees above normal. The cold spot was in Faith where temperatures averaged 3.7 degrees below normal.
Precipitation in January was well above average, averaging 200 to 220 percent of normal. The wettest areas were across the northern Black Hills, Bear Lodge Mountains and far northwest South Dakota where precipitation averaged 250 to 300 percent of normal. The driest area was across southwestern South Dakota where precipitation was 80 to 120 percent of normal. The wet spot was at Dupree where precipitation was 400 percent of normal. Ardmore 2N was the dry spot with only 50percent of normal precipitation. The precipitation surplus for the month averaged 0.52 inches.

Snowfall was also well above normal in January. Across the northern Black Hills and Bear Lodge Mountains 2 to 3 feet of snow fell. Across the plains of northeast Wyoming snowfall averaged 10 to 20 inches. Snowfall averaged 15 to 25 inches across northwest South Dakota with 7 to 14 inches falling over the rest of the South Dakota plains and over the southern and central Black Hills.

January storm summary...

January 8…An upper level disturbance moved along an arctic codl front and brought 6 to 12 inches of snow to the Bear Lodge Mountains and the northern Balck Hills, with 3 to 6 inches falling elsewhere on the plains of northeast Wyoming and western South Dakota.

January 22…An upper level disturbance moved across the region bringing snow to the the northern Black Hills, Bear Lodge Mountains and northwest South Dakota. Across the northern Black Hills and Bear Lodge Mountains 4 to 9 inches of snow fell, with 2 to 4 inches over northwest South Dakota.

January 29 – 31…A series of upper level disturbances moved across the region bringing 2 to 5 inches of snow to western South Dakota and northeast Wyoming.

LOCAL EXTREMES Rapid City Lead Gillette
Temperature Temperature Date Temperature Date Temperature Date
Max. Temp. 55 degrees 28th 47 degrees 28th 53 degrees 28th
Min. Temp. -13 degrees 31st -18 degrees 31st -14 degrees 11th
Precipitation Rapid City Lead Gillette
Monthly Data Amount Date Amount Date Amount Date
Precipitation 0.54 inches   3.41 inches   0.88 inches  
Snowfall 8.7 inches   39.1 inches   11.8 inches  
Daily Data Amount Date Amount Date Amount Date
Max. Precipitation 0.14 inches 22nd 0.64 inches 17th 0.34 inches 9th
Max. Snowfall 1.9 inches 18th 6.5 inches 18th 5.5 inches 9th
             
REGIONAL EXTREMES Western South Dakota Northeast Wyoming
Temperature Temperature Site Date Temperature Site Date
Max. Temp. 57 degrees Porcupine 11N     29th 53 degrees Gillette 4SE 28th
  57 degrees Wind Cave 29th      
Min. Temp. -29 degrees Hoover 12th -26 degrees Devils Tower 12th, 13th
Precipitation Western South Dakota Northeast Wyoming
Monthly Data Amount Site Date Amount Site Date
Max. Precipitation 3.41 inches Lead   2.05 inches Upton 14ENE  
Min. Precipitation 0.20 inches Ardmore 2N   0.73 Wright 12W  
Max. Snowfall 39.1 inches Lead   22.7 inches Upton 14ENE  
Min. Snowfall 4.0 inches Long Valley   7.8 inches Newcastle  
Daily Data Amount Site Date Amount Site Date
Max. Precipitation 0.70 inches Dupree 9th 0.68 inches Dillinger 9th
Max. Snowfall 8.0 inches Bear Ridge 9th 8.0 inches Dillinger 9th
  8.0 inches Oglala 1S 1st      
             
MONTHLY RECORDS WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING
LOCATION DATE NEW RECORD OLD RECORD DATE
Devils Tower January 1.78 inches precipitation 1.57 inches precipitation 1994
         

 
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