In terms of degrees I haven't a clue, but it all works with Boyles law, i.e. pressure x volume is a constant, and an increase in temperature results in an increase in pressure, therefore to rectify the constant, tyre pressures should be dropped (at least that is how I understand it). In more realistic terms, that means that in any reasonable conditions, the optimum pressure is around 12psi (ish). On hot days, experiment with lower pressures, on cold days experiment with higher pressures. Temperature is very difficult to measure, because ideally you need some sort of thermometer inside the tyre to get an accurate reading, otherwise it is a case of pulling into the pits and placing a thermometer on them, at which point you have given the tyres sufficient time to cool down and are no longer at race temperature anyway. Rather than measuring temperature of tyres, you would be best to try different tyre pressures, seeing how they feel, and making a note of the weather conditions.
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