This is an interesting observation that needs more study.
Guest essay by David Archibald
Wiggle-matching has been used by the best. Hubert Lamb, considered to be the most meticulous climatologist of all time, used wiggle-matching in this wind data graph he published in 1988:
He had plotted up 600 years of wind data at London, noted a 200 year periodicity and copied the line 200 years to the right to make a forecast.
One of the puzzles of the last 300 years of climate is the temperature drop of 1740. It came out of the blue after a number of warm years in the 1730s. There is nothing in the Be10 record or the volcanic record to suggest a cause.
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