The graphs below show historical annual temperature anomalies, i.e., differences compared to the reference-period average from 1951-1980, for Portland (ME), US and global. The red lines are five-year average anomalies. The last year cooler than the reference-period average was 1982 in Portland, 1993 in the US and 1976 globally. Some skeptics have pointed to the relatively flat global temperatures from 1998 to 2011, but each of the last three years have set records and the ten-year averages clearly show the steady upward trend since the mid 1970s.
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SOURCEWeather statistics are based on 5-minute readings at an Ambient Weather station near Mill Cove off of upper Harpswell Sound. Archives
December 2015
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