I went Jan 25-Feb 1 expecting Cozumel-like temperatures of high 70's to low 80's, so I just took my 1 mil suit with a 3 mil shorty and I FROZE! My BC also has a 2 mil vest and I wear a 3 mil beanie and I still shivered through every one of my 13 dives. My dive computer registered about 77 all week, so if you add that to multiple dives on multiple days, you lose a lot of body heat even if the sun comes out topside! I wished the whole week I was in Roatan that I had packed the Jane half of my Jane/shorty combo. I think the weather has improved slightly since my return to the US, but in my opinion it's better to take a heavier suit and let water in to cool off if you get hot than spend a week shivering!