Yea I'd also like to see how April or May 80 or 85 plus correlates if at all to summer 90s, just not sure that 90 is some magical threshold necessarily in early season.
While an interesting tidbit...I'm not sold on needing a 90 in Apr May to get that many 90s later. There's plenty of 20 plus 90 degree day summers in there too.
Edit: By 20 plus I mean 20 plus 90 days in summer without an Apr or May 90. Also worthy to note that there are a couple 29 90 degree day years without an Apr or May 90.