Rob,

I took a look at temperatures & correlations (based on de Bilt, The
Netherlands data).

There is no appreciable correlation between summer & winter and vise
versa. The well known example of 1947 sticks in the minds of many
people (a cold winter and especially a very cold February followed by
a long and hot summer), but it is really the only clear example in the
entire 20th century.

There is a weak correlation between winter and the following spring.
The same holds for summer and the following autumn. But that is all.

Just see:
http://www.euronet.nl/users/e_wesker/weer/stats.html
http://www.euronet.nl/users/e_wesker/weer/winterv.html
It is in Dutch, but the graphs / numbers are self explaining.

Mazzel & broge / kind regards, Evert Wesker
Amsterdam, The Netherlands
http://come.to/wesker (redirect URL, no adv's), or
http://www.euronet.nl/users/e_wesker/