In article ,
Philip Eden writes:
Pressure difference 60degN minus 50degN over the British Isles:
Feb 1947 13.9 mbar
Feb 1986 12.9
Apr 1877 8.6
Jan 1941 8.3
Dec 1927 7.8
Dec 1995 7.0
May 1946 6.8
Jan 1963 6.7
Oct 1960 6.6

I'm surprised that Feb 1956 doesn't feature.
--
John Hall

You can divide people into two categories:
those who divide people into two categories and those who don't