For the record, so I can check and compare in future years, today, Saturday 21 April 2012, is my first time in the pool this year. The water was cold but not freezing.
I had no intention on going in but I took the 2-year-old out to the pool and she jumped in immediately and was insistent with a "come on daddy" so I eventually dived in. Took about 10 seconds to get used to it and it was beautiful. I can't imagine living in Arizona without easy access to a pool.
Today and tomorrow will peak at 100F (38F) so it won't be long before the pool is luke warm again.