I love hearing from others who do the winter wakeboarding. My family has been on the local lakes here in SoCa. all year, no one is out there. The water is perfect....not another boat in sight except a few fishermen. These fishermen are all bundled up in coats, very funny.
Summer time here the lakes are blown out by noon and there are so many boats you can't move.
Invest in a wetsuit for $100. and you are good to go.
Water is about 60 deg., air about 45deg to 70deg.

Brent
Ventura, CA