The weather is the evil thing isn't it! We went in February 2 years ago to Discovery Cove, we had one of the warmest days of our vacation, it was about 82. We booked to go again last year in March when we were there, just for the day and no dolphin swim, we had the worst weather possible for a DC day. It was cold, and we had 2 days of torrential downpours, it sucked! We were able to go that morning, and ask if we could change the day, and the told us, we would have to pay the difference in price (we got a good price up til the 13th of March with the rescue the reef promo, price went up after the 13th) it was going to cost us another $200 which I didn't have many days to change cause I only had 3 more days of vacay, they were good, and extended it for a year, so we are going back March of this year! Good luck!