We had 7 cold days a month age. The temperature dropped to 34 once. The bananas looked healthy after the cold weather. But after a few warm days the damage become visible. For two weeks the leaves kept dieing, and then new leaves started to grow. They will start looking good in May. 
These are Ae Ae bananas that I have grown for over 40 years.My Ae Ae site will show you some pictures of my bananas.
I also have a program 'My Ae Ae Brother' for giving them away.
Unfortunately it's only for people living in south Florida