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Seven year glitch


It is interesting to learn that the Meteorological Office climate predictions unit expects a warm summer this year on the basis of a 'statistical seven year cycle' and the fact that 'this type of weather was last seen in the mid-1990s' (NCE 10 May).

Just for the record, the mid 1990s drought was in 1995, which was only six years ago in my book - and the previous droughts were in 1989, 1990, 1991 and 1992. Can someone tell me how exactly this statistical seven year cycle works?

AN Beal, 10 King Georges Avenue, Chapel Allerton, Leeds LS7 4LH

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