February temperatures were well below normal, averaging 6 to 8 degrees below normal. All locations reported below normal temperatures. Deadwood 2NE was the warm spot averaging 4.4 degrees below normal. Devils Tower in northeast Wyoming was the cold spot averaging 9.6 degrees below normal.
February was a wet month, with precipitation averaging 190 to 210 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 areas were across southwestern South Dakota where precipitation averaged 100 to 125 percent of normal. The wet spot was at Cole Canyon in the Bear Lodge Mountains of northeast Wyoming, where precipitation was 412 percent of normal. Ardmore 2N was the dry spot with only 50 percent of normal precipitation. The precipitation surplus for the month averaged 0.54 inches.
February was a snowy month with snowfall averaging 280 percent of normal. Across the northern Black Hills and Bear Lodge Mountains snowfall averaged 24 to 36 inches. On the plains of western South Dakota, including the central and southern Black Hills, snowfall averages 12 to 24 inches. The plains of northeast Wyoming averaged 8 to 18 inches of snow.
February 5 - 7…A series of upper level disturbances moved across the region bringing heavy snows to the northern Black Hills and Bear Lodge Mountains, where 18 to 24 inches fell. On the plains of northeast Wyoming and far western South Dakota, snowfall was 1 to 3 inches.
February 19-20…A strong upper level storm system brought widespread snow to the region. Across northwest and central South Dakota 10 to 18 inches of snow fell with 5 to 10 inches aross the rest of the South Dakota plains. Across northeast Wyoming 2 to 5 inches of snow fell.
February 23-24…A strong upper level storm system brought 8 to 12 inches of snow to the southern and central Black Hills, southwest South Dakota and across Weston County in northeast Wyoming. Across the west central and south central plains of South Dakota 4 to 8 inches of snow fell…with less than 4 inches reported elsewhere.
|LOCAL EXTREMES||Rapid City||Lead||Gillette|
|Max. Temp.||67 degrees||15th, 16th||53 degrees||15th||51 degees||16th|
|Min. Temp.||-20 degrees||2nd||-24 degrees||1st||-23 degrees||1st|
|Precipitation||1.16 inches||2.50 inches||1.10 inches|
|Snowfall||22.9 inches||35.0 inches||13.7 inches|
|Max. Precipitation||0.54 inches||20th||0.78 inches||5th||0.40 inches||21st|
|Max. Snowfall||9.7 inches||20th||13.7 inches||6th||4.0 inches||21st|
|REGIONAL EXTREMES||Western South Dakota||Northeast Wyoming|
|Max. Temp.||73 degrees||Winner||17th||60 degrees||Colony||15th|
|Min. Temp.||-31 degrees||Hoover||2nd, 3rd||-33 degrees||Devils Tower||2nd|
|Precipitation||Western South Dakota||Northeast Wyoming|
|Max. Precipitation||2.50 inches||Lead||1.51 inches||Upton 14 ENE|
|Min. Precipitation||0.44 inches||Ludlow 3SSE||0.35 inches||Colony|
|Max. Snowfall||35.0 inches||Lead||19.8 inches||Sundance|
|Min. Snowfall||7.0 inches||Mission 14S||7.1 inches||Colony|
|Max. Precipitation||1.12 inches||Bison||20th||0.40 inches||Gillette 4SE||21st|
|Max. Snowfall||18.2 inches||Bison||20th||9.5 inches||Newcastle||24th|
|MONTHLY RECORDS||WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING|
|LOCATION||DATE||NEW RECORD||OLD RECORD||DATE|
|Bison||02/20/2011||1.12 inches precipitation||0.80 inches precipitation||02/26/1998|
|Bison||02/20/2011||18.2 inches snowfall||10.0 inches snowfall||02/26/2009|
|Camp Crook||02/20/2011||12.0 inches snowfall||12.0 inches snowfall||02/22/1914|
|Camp Crook||February||1.10 inches precipitation||1.10 inches precipitation||1909|
|Camp Crook||February||23.0 inches snowfall||19.0 inches snowfall||2007|
|Faith||02/20/2011||0.91 inches precipitation||0.85 inches precipitation||02/28/1951|
|Interior||02/21/2011||9.0 inches snowfall||9.0 inches snowfall||02/27/1987|
|Lemmon||02/20/2011||10.0 inches snowfall||10.0 inches snowfall||02/27/1951|
|Long Valley||February||2.33 inches precipitation||2.01 inches precipitation||2009|
|Long Valley||February||25.0 inches snowfall||20.0 inches snowfall||1987|
|Rapid City Reg. Arpt.||02/20/2011||9.7 inches snowfall||8.7 inches snowfall||02/09/1953|
|Redig 11NE||02/20/2011||0.86 inches precipitation||0.80 inches precipitation||02/22/1979|
|Redig 11NE||02/20/2011||14.0 inches snowfall||9.0 inches snowfall||02/12/1907|