Last month was the fourth-warmest January in the contiguous United States on record, according to the National Oceanic and Atmospheric Administration.
This chart shows three decades of Januaries. Red bars represent the percentage of the country that experienced “very warm” conditions compared to the norm:
Great work by the Houston Chronicle’s graphics director, Jay Carr:
Larger version | Via Eric ‘SciGuy’ Berger
These maps capture the warm winter we’re experiencing in the Mid-Atlantic and Northeast states. The top map shows the average temperature so far this December. The bottom map shows how that figure differs from the norm over the last three decades:
Source: National Weather Service, Climate Prediction Center