northern hemisphere ? that narrows it down to 1/2 of the earth...

care to expand on that ?

i think as long as it has a month or 2 before winter, you should be fine, but, that depends on how cold the winter gets. when and how much rain you get etc...

Thank you for your answers, I live in Tunisia, north africa, winter is in 4/5 months, we are not a cold country. It is pretty hot right now (above the 90's fahraneit)

If you can grow them outside over winter there shouldn't be a problem. The ground usually stays warmer, unless you have very cold rain. A drier winter is better for them.

I got my mango grafted tree (kent) today :) I am very excited, i will plant it tomorrow. Here is a picture of it. The half of the trunk is wood and the upper half is green. I hope it gets well in my garden and that it can bear fruits soon :) Should i put a support (a bambou or a piece of wood) to it, knowing that the trunk size (circumference) is 11cm (4,3 inches)?

Probably a good idea, until the trunk thickens up and strengthens. Winds during winter, when it's not growing, could damage it. Make sure you don't let any new shoots develop below the graft.