I thought we had La nina last summer. Here in RI it was one of the worst summers I remember. Sprinkled only twice, and every damned day was 85 and sunny. Disgusting.
If I wanted to live in hell I’d move to California.
According to the charts above, La Nina began in March to April and really got going in the Fall to Winter of last year. Due to your location, the Atlantic probably has the greater influence on your temperatures. Apparently, what you want is that the Gulf Stream stops. That would give you some colder summer days.