I have repeatedly over the years received e-mail etc warning that cruise control in rain or snow can cause the car to accelerate out of control. I just received the message again, and went to snopes.com so I could refute the message, and they confirmed it. I still do not believe cruise will ever accelerate out of control because once you go past the set speed it cuts the throttle. Am I missing something? I have used cruise in snow and rain for decades, and never had a problem. Cruise is how I stay out of traffic court, keeps my foot away from the ticket pedal.
Typical bad story, written by people who don't understand how cruise control works - hydroplaning (or skidding) will NOT cause the car to "accelerate out of control". That said, it's not a great idea to drive with the cruise on in "heavy rain" or snow when road conditions are likely to change rapidly. I make maximum use of cruise under normal conditions too.