The temp here rarely gets below 17degrees C. Days are mostly around 32 to 37 degrees C. Its the dry hot mongrel wind we get at this time of the year that tends to knock a lot of the trees etc around. Our Mangosteens do it tough this time of year, we put extra water on them to get them through. We planted some mangosteen trees under black sapote trees because the sapotes grow quickly and produce good shade, this was a mistake because the sapote root system is so much stronger than the mangosteen root system, the mangosteen struggles to get enough water. Nutrients aren't a problem as we feed the mangosteens through their leaves. We are now using banana plants for the shade for our mangosteen trees.