For several years, some commentators who deal with historic temperature data in their daily work, such as Joe D’Aleo of ICECAP, have stated that warming trends suddenly appeared in areas in which there were no such trend previously, such as the state of Maine.
Until about 2011, the government published data showed no trend from 1900 to present. Suddenly, government published historic data showed a warming trend of about 3 degrees F. Tony Heller (who goes by Steve Goddard) has followed this issue, graphically showing that trends appeared in recently published historic data, where earlier historic data showed none.