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i too, have skied in 40° water.
oh wait, no, that was 40° Celsius ... that's about 104° f no big deal
oh wait, no, the water wasn't 40° C .... it was the air.

joking aside, sorta .... one thing about water skiing in 40°f air or water ... you don't get a lot of folks making wakes all over your flat water. Still - there are always a few that will do it ... weather it's making lots of uncomfortably long drives, or getting in uncomfortably cold water. You gotta have HUGE cajones to water ski in air or water that's 40° .... but trust me .... they won't be for long!

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Until the first time I got into 40F water without a wetsuit, I had no idea how incredibly painful it was. It was like being stuck with thousands of needles every second and it literally takes your breath away.