I used to waterski in the lakes around here where most temps reach mid 60'sF by summer. I found wetsuits are not very warm when the water temps are below 60. I used to be one of the first ones out on the lake waterskiing, quite often about a week after the ice disappeared, water temps around 40F, I am much older and wiser now ;\)

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70