JT has already said most of the important things, when it comes to tyres IMHO, the main thing to remember IMHO, is that you cannot (or should not) see things in isolation (like CoF vs. temperature), because it's just a two dimensional snapshot of a multi-dimensional "problem'/problem.
As JT said, it is unlikely, that you will come across any specific numbers for your given tyre, unless you have a close collaboration with the manufacturer, or can do your own tests.
You will find some free information's about "CoF vs. temperature" for different "rubber" compounds in the internet,
such as this one:
but as you see, this is not only influenced by temperature, you see that the rubber compound (here described as different values of TG (Glass Transition Temperature), the vertical load and the sliding speed/velocity all come into it.
But as most people on here, will like some "shiny graphics", here is one from Michelin, showing some values, but again as you see, it's an surface response plot, including in this case sliding velocity (which means it's for a given tyre, and other parameters such as vertical load/contact pressure etc etc. are assumed to be constant)
Therefore, it's not really helpful for you, as you cannot/should not extrapolate this to your own tyre(s), it's just a "nice illustration"
try google for "The pneumatic tire" +ebook+pdf etc, it should bring up a free E-book from the nhtsa.
Inside you will find some useful info (IMHO) concerning some of your questions.
I'm afraid there is no "simple" answer to them, but I'm sure that the book will enhance your understanding
of the topic.