I have heard of a "blackberry winter", although I have no idea what it means.
(Isn't the Internet so handy? I just read at http://davesgarden.com that oldtimers knew that blackberries need a cold snap to set buds on the blackberry canes, so as sure as night follows day, there will be a cold snap when the blackberries bloom, called "Blackberry Winter".
Well, okay, now I know. And I also know we're having a blackberry summer!