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It is just based off of biotemperature and doesn't take moisture and precipitation into account.
Some subtropical areas are dry and some are warm.
Phoenix is subtropical and dry while Charleston is subtropical and wet.
So what are the characteristics of maritime vegetation? - if bio temperature aligns with vegetation, then shouldn't there be a commonality that over rides any other differences, between the vegetation in my area and Belgium's vegetation?
While I understand the 6C threshold, it would put Atlanta metropolitan area in the northern edge, I'm more comfortable with Knoxville.
I don't know why people believe leaveless dormant trees make a climate not subtropical.
Atlanta is a strange case. Because it's at elevation it's going to be colder than someplace like Augusta by a little bit. There has got to be a massive UHI in Atlanta metro though which might offset things if we look at recent averages as opposed to the full historical ones.
There is a pretty stark autumn period here early December, with things beginning to green again in late March. It lines up almost perfectly with the official dates of winter.
But humid subtropical is supposed to be describing a climate with hot, muggy summers where it is the dominate season and milder, cooler winters. Mildness is going to differ in feel from person to person but what Koppen/Trewartha were getting at was a largely snowfree winter climate. Even a place that might average 3 or 4 snowfalls annually while the rest of winter precipitation is rain is usually going to have temps that are averaging way above freezing.
Largely snow-free is an easy hurdle to clear and would include places like DC and Philadelphia. Unless you mean to say Hunting Island has the same climate as Philadelphia?
I would not classify this as a continental climate. It has a clearly summer dominant seasonal pattern and the small diurnal ranges and humid weather that it would definitely be humid subtropical.
This one is humid subtropical, but almost tropical and shouldn’t be used as a middle of the road example, but it probably is closer to the examples being listed. The only cities that aren’t controversial seem to be Bermuda, Tampa, Brisbane, Durban and places that sit right on the borderline of tropical when really places like St Louis, Philadelphia and Yancheng would be good examples too, just on the other end of the spectrum
I would not classify this as a continental climate. It has a clearly summer dominant seasonal pattern and the small diurnal ranges and humid weather that it would definitely be humid subtropical.
Cape Reinga is nothing but Oceanic in my view - Oceanic just explains all climates within the temperate zone that are temperature moderated in all seasons due to prevailing winds coming from the sea. However it does have a subtropical environment.
So what are the characteristics of maritime vegetation? - if bio temperature aligns with vegetation, then shouldn't there be a commonality that over rides any other differences, between the vegetation in my area and Belgium's vegetation?
I was implying that I was talking about North America when I mentioned "subtropical vegetation". North America has distinct Oceanic vegetation too on the West Coast. I apologize for the confusion.
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Not distinguishable from Cuba or the Bahamas 
