This is anecdotal but I nearly always find CX cabin temperatures to be too low. I usually ask for two blankets. SQ get it about right, at least for my taste.
As I mentioned before, for real numbers you can search Twitter for #JL or #OZ #cabintemp for temperature and humidity.
I personally never feel hot on JL flights but I did today on the HND-Shibuya airport limo bus. Measured 26.7C and 37% humidity (it was raining to be fair).
Last edited by sixpaq; Apr 13, 2016 at 8:01 pm
Reason: bad grammar, as usual