Summer Temperature Averages (ºF), 1950s-Present

Average summer temperature has risen about about 3°F since the 1950s

The five-year average for each site is determined by taking the average of a given year's June, July, and August temperatures and comparing that against the two years before and two years after it.
Chart: Julia Tilton Source: Sean Birkel, Maine temperature records Created with Datawrapper