I don't have the time to analyze 30+ years of data, but it does seem like this springs cold spells have been more dramatic than in previous years. The warm spells do not seem to have been all that unusual though.
The past few Saturday's have been rather crummy, with the cold and snow, but it is not unusual for the weather to repeat itself on the order of around every 7 days or so.
As far as this summer, it is not a matter of effort, but rather the fact that there is no reliable way to forecast the weather out that far, so I do not do it.
-John