Since I got used to continental summer most years on holiday I think I've developed an expectation of better weather here. But we have had great summers, particularly in the early 90's and that set us up to expect them as the norm.
It feels as if we have been very unlucky here with some of the best weather landing on weekdays and then becoming cool and miserable at the weekends. The SE has definately had better summers than the rest of us - but last year it was the other way round.
I'm unsure if it's wishful thinking, or a real change in the weather patterns. But I did seriously consider living by the med for a while to get the long decent days of sun and heat - which I love. Knowing we can get them here but not getting them for several years now increases the frustration which is reflected by many on this forum.