Originally Posted by Trimix
Yes, but thats the temp of the tube, which may not be the temp of the air inside it. How well does the tube conduct heat to the air in it ?
How hot is the air in your car when you leave it closd up on a sunny day?
Air has a fairly low specific heat, so the air in the tubes gets hot. Potentially hotter than the tubes.
My local waters are never more than about 52F. On hot days I always vent, sometimes before even pulling it out of the water since bursting a seam is going to be a disasterous expense.