I got 23F outside as minimum last week, and 40F inside as minimum. The mango is still alive but, as during last winter, a black spot as appeared on the new growt. I think it is the same bacterial/fungal disease, it won't go away till the climate will be more dry. Too bad my max temperature are around 70F inside, so i guess it is enough to let the sickness develop.
And now i have to understand if i should cut or not.