In article ,
Paul Hyett writes:
ISTM this year must have had the longest period between first & last
80F+ readings on record - the first in mid-Apr, and still ongoing.

1959 might be in contention. The first one was probably some time in
May, the last one in early October, IIRC.
--
John Hall
"Men occasionally stumble over the truth, but most of them pick
themselves up and hurry off as if nothing ever happened."
Winston Churchill (1874-1965)