Except, of course, 1990 and 1991 both with a CET of 3C.
Winters from 1963/64 to 1977/78 didn't have any that cold. Neither did the
winters from 1895/96 to 1915/16.

Victor

Sorry to be prenicity, but wasn't the winter of 1976/1977 rather cold? It
always seems to be overlooked for some reason.

I wouldn't say 1990 or 1991 were VERY cold. By recent standards maybe.

December 1995 had a mean temperature of -1.4°C here, probably the coldest
month at this location since January 1979, or maybe even 1963.
There are always exceptions to every rule.
Statistical trends may point to a mild winter at hand but there are always
exceptions to every rule.