We have been there a couple of times during the last week of Feb. - first week of March. In 2010, it was cooooolllllddd. We went swimming once cuz the girls really, really wanted to. There was steam rising from the water. We wore long pants and sweaters most of the time (during the day as well). It was the first time we ever had weather this cold. Mind you, we loved it cuz it was way warmer than at home.
Be prepared!!!!