disneyuk - I did swim with the dolphins and I thought it was wonderful

I think my swim was around 11:30am - I arrived at the park at 9:30am. This was fine for me, loads of time to get ready and I spent a while snorkelling before my swim. Given a choice, I would select a pre-lunch swim, but I am not sure how much difference it makes. I spent some time watching other people's dolphin swims in the afternoon and they seemed to be having just as good a time as I did
Linclaire - I was there on Jan 15 and with the aid of weatherunderground, can you you that the average temp on that day was 55F (low 45F high 65F). Although sunny, it was a bit chilly and not really sunbathing weather. They provide wetsuits which helps a lot to keep you warm both in and out of the water (avoiding looking in all mirrors of course

). I wore a shorty one and wasn't cold at all either during the dolphin swim or in the snorkelling lagoon. That said, I did overhear quite a few people commenting on how cold the water was and the Crazy River section where the water was heated did seem to be very popular - so I guess it comes down to personal preference. Another advantage was the park wasn't full - around 600 guests only - so I had no problems with queuing for showers/food/photos etc.
Weather wise in general, apparently it was one of the coldest January's ever and I did see some frost very early one morning. I was fine wearing a light jacket and/or sweatshirt, but there were plenty of locals wearing full coats & gloves on some days.
I have to admit that I am not a sunlover and I would always choose to go when it was dry & colder rather than hot, particularly if I am visiting the theme parks. I still shudder at the memory of doing Euro Disney in August a few years ago when the weather was 90+.