Thursday, January 10, 2013

December 2012 U.S. Climate Summary

December 2012 Statewide Climate Summary

Nebraska:  Near normal temperatures and precipitation in December 2012

 National Overview from NCDC:  (Note two maps are located at the bottom of this post)
  • Climate Highlights — December
  • The average contiguous U.S. temperature for December was 36.4°F, 3.4°F above the 20th century long-term average, and the 10th warmest December on record.
  • Warmer-than-average conditions were present for much of the U.S. east of the Rockies. Twenty states had monthly temperatures that ranked among the ten warmest on record. Near-average conditions were present for the Northern Plains and much of the West. The Pacific Northwest was slightly warmer than average.
  • The nationally-average precipitation for December was 2.74 inches, which was 0.51 inch above average and the 20th wettest December on record.
  • Wetter-than-average conditions were present for the interior West, where Nevada and Utah both had a top ten wet month. The Northeast and parts of the Ohio Valley had a wetter-than-average December. Maine, New York, Ohio, and Pennsylvania also had a top ten wet month. The Southern Plains were drier than average during December.
  • According to the January 1st, 2013 U.S. Drought Monitor report, 61.1 percent of the contiguous U.S. was experiencing moderate-to-exceptional drought, smaller than the 62.7 percent at the end of November. Drought conditions improved in parts of the Southeast, Northwest, and northern California and Nevada. Drought conditions worsened in parts of the Southwest and Southern Plains.
  • Several large snow storms traversed the nation during December causing the monthly average snow cover extent to be above average. According to data from the Rutgers Global Snow Lab, the monthly average snow extent of 1.3 million square miles (3.2 million square km) was 100,800 square miles (261,100 square km) above the 1981-2010 average and the 14th largest monthly snow cover extent in the 47-year period of record.


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