I think that the first tip is to avoid changes of temperature very sudden. There are times that we are in a climate of a "little ice cream" and it is bearable. In such cases, do not expose your hands to heat as it is a cold not worrying. In those cases in which the air conditioning this very ice cream, I recommend to cover the hands in the pockets and use gloves thin (thin as the first layer) because these gloves don't heat up too much the hands but do so gradually.