- 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.
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