Yes, it is true that several Florida varieties of mango fruit very well in northeastern Brazil, which is semi-arid. But it is not true when those same varieties are taken to northern Brazil, Amazonia, where the dry season is usually 3-6 weeks, and the annual low temperature is around 68-degrees F.
There are several, long-cultivated-in-the-Amazon-region polyembrionic varieties of mango, which produce heavily every year; however, of the dozen or so varieties introduced from Florida to the Amazon in the 1970's and since, only the Nam Doc Mai has fruited. The others went decades without even flowering. [Some apparently did eventually, flower. I am guessing that that occurred in years of extreme drought or lots of smoke. No fruits were reported.]
So I do speak of some mango varieties as being truly tropical, and of most mango varieties as being sub-tropical. [Definitions of "sub-tropical" are all over the place, per some, even including Washington, D.C. Per me, "Some freezes or frosts recorded, but not every year."]
I realize that drought-stress can be an alternative stimulus to flowering, but here in Florida, where we get considerable dry weather, including tree-wilting droughts in the middle of what is supposed to be rainy season--- and we don't get late summer blooms from that--- we in the trade, believe that the timing of the start of the next mango season is determined by the timing of the first several nights of weather in the fifties F.
Here in in the "coastal strip" in southeastern Florida, the first cool snap may occur in mid-October, in which case the very early varieties will have ripe fruits in late March or early April. If the first cool snap is in mid-December, the season will start near the end of May.