December temperature data for the continental U.S. has been released by the National Climatic Data Center and as I have done in previous months I have graphed the data to show the temperature trend. It appears that since 1998 there has been not only no significant warming in the U.S. but instead there is a clear cooling trend. Now, 13 years is not a very long time in the big picture but it must be remembered that during this time period atmospheric carbon dioxide levels have continued to climb. If carbon dioxide is causing unprecedented warming and we keep pumping more and more of the gas into the atmosphere then why are we seeing no evidence of warming in the U.S.? More importantly, why are we seeing a cooling trend? And why is this cooling trend showing signs of increasing? The latest data shows a cooling trend of 9.4 deg F (17 deg C) per century. This should be all very embarrassing to the global warming crowd.
Most Recent 12-Month Period (Jan.-Dec.) 1998 – 2010
1998 – 2010 Data Values
Trend = -0.94 def F / Decade (-9.4 def F / Century)