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First half of December extremely mild in most of U.S.

The temperature pattern this month is a rough approximation of the year to date average. The warmest air worldwide has been in the United States in parts of the Arctic this year. The number of record high temperatures has dwarfed the number of record low temperatures. (http://www.ncdc.noaa.gov/extremes/records/)

Period Hi Max Hi Min Lo Max Lo Min
Yesterday Dec 16, 2012 12 141 10 0
Last 7 Days Dec 10 – 16, 2012 148 425 26 62
Last 30 Days Nov 17 – Dec 16, 2012 2,104 2,311 103 127
Last 365 Days Dec 18, 2011 – Dec 16, 2012 34,464 32,426 8,898 6,333
Month to Date Dec 1 – 16, 2012 1,480 1,719 40 67
Year to Date Jan 1 – Dec 16, 2012 33,712 31,717 8,833 6,301
Last Year to Date Jan 1 – Dec 16, 2011 25,911 28,970 15,638 9,618
2m Temperature Anomaly - Year to Date
2m Temperature Anomaly – Year to Date

It will be interesting to see how the weather evolves in the lower 48 this winter. Many computer models are showing a shift from warmer than normal to colder than normal in the next several weeks. The first places to see the drastic change will be in the Upper Midwest where some places may see enough cold air in the next two weeks to completely offset the very warm start to the month. In Southern New England, the month will most likely average warmer than normal, but not to the degree that it has been for the past two weeks. If the storm track doesn’t change, it will go into the books as one of the least snowiest Decembers on record in Providence, Worcester, Boston, and Hartford.

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Fred Campagna

President and Chief Meteorologist - Right Weather LLC AMS Certified Consulting Meteorologist #756 AMS Certified Broadcast Meteorologist #126

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