>>1015086It's just one part of the bigger picture though, mostly an indicator for how perennials will get over winter.
I'm in 8a but also in Yurop, so it's rather oceanic and not a lot of summer heat, some zone 6 or even 5 places in inland Murrica have much better summer heat for growth.
Here winters are mild enough for windmill palms to survive, but the cool summers make stuff like pomegranates, olives and watermelons, even some apples like Cripps Pink borderline to ripen out, Japanese banana usually won't ripen at all
