Yes, I grew up in the city of Manaus. The climate there is not really monsoonal--- the rains are almost year-round. The dry season tends to be just 2-4 weeks, but can be twice that, in extreme, news-making years.
Many mangoes have been taken there from Florida, which have never flowered, in almost 50 years of growth.. Only Nam Doc Mai, taken from Florida, has fruited. But half a dozen local types of mango, including 'Rosa', fruit well every year.