On Wed, 18 Feb 2009 at 02:17:10, Graham Easterling
wrote in uk.sci.weather :

BTW, what was the mean temperature for Penzance in Jan'63?

I don't know, but I'm sure someone on USW has access to the figure.
The lowest maximum temperature in Jan 1963 was 0.0C.

It suddenly occurred to me to check back in my old Whitakers Almanacs :

Penzance - Jan'63 mean : 1.8°C.
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)