"John Hall" wrote in message
...


So I think, even if you're very cautious, you can rely on the values
from at worst 1772 to be high accurate.

Yes, but how good was the data the the series is based on? It was not from
Met Office approved sites, like that since 1910. Manley, and later Parker,
have done a lot of good work, but you can't make a silk purse out of a sow's
ear.

Cheers, Alastair.