into three sub-periods, a very warm one to 1942, a colder interval during 1943 to 1952, but it was decisively warm during 1953 to 1964.
The cold period 1965 to 1995 also included a few sub-periods. The so called "sea ice years" 1965 to 1971, a slightly warmer period 1972 til 1978, a very cold interval during 1979 to 1986, but thereafter it became gradually warmer, the last cold year in the
sequence
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