
So your problem is that the CTX 1300 won't tell you how cold it is once its colder than 14*F? Can't you just check the weather on your phone before you leave or something? I just don't see how this problem is really fixable. Are you going to buy a new thermometer?
What's the coldest temperature you've ridden in? What kind of cold gear do you have?
I find this kind of a funny problem to have...