December 2009 U.S Temperature Averages 

 



Use this link to get the graph for each state:  NCDC December Temperature Time Series for Each State


Temperature Highlights - December 2009:  From the National Climatic Data Center
  • The December 2009 temperature for the contiguous United States was 30.2 degrees F, which is 3.2 degrees F below the long-term average. For the year 2009, the contiguous U.S. averaged 53.1 degrees F, which was 0.3 degrees warmer than the long-term average.

      

  • For December, the nationally-averaged temperature was below normal as several punches of Arctic air dove deep into the United States. December temperatures in the West North Central region were the eighth coolest on record and the South region experienced their ninth coolest December. Below-normal temperatures expanded westward into the Northwest, West, and Southwest. Of the nine climate regions across the contiguous U.S., none averaged warmer than normal temperatures.   

    

  • Statewide temperatures coincided with the regional values as nine states recorded much-below normal temperatures. Nebraska had its eighth coolest December, Texas, Nevada, and Wyoming their ninth, and Montana and Utah their tenth coolest.

 

Applied Climate Science 
School of Natural Resources