Water Ride Summer/Winter Mode

[the ghost]

I went on Splash Mountain last night with my friends at Disneyland at around 10:30pm. It was in the mid sixties and we noticed people completely soaked off the ride and made nothing of it. We went on and got COMPLETELY soaked so I jokingly asked the ride op "is this in summer mode" and she said its in the same mode every year. Grizzly does have a summer mode, but the only differnce in modes that I have noticed is that the water effects on the lift are turned on, which IMO does not mean it has a true summer/winter mode. Is there really such a thing as summer/winter mode on log/rapid rides or are they a myth?