Very interesting, how cold the period of 1986-87 was. Many months of below average temps, and poor spring and summer months.
Looks like something changed between the late summer of 1987, and spring of 88.
March 88 was the first warmer than average one for quite some time, and the start of a string of milder Marches.
Also, May 88 was the first one without a frost since 1970?
Combined with the milder winter period in 87-88, indicates a change compared to the previous 20 or so years. Not sure the hurricane has anything to do with it.