Me being a cheap prick and living in Maine, it's about 64* F inside; though I think TAT is a little off. It's been about 10* F here all week - not factoring in 20mph winds.
So -12*C - no wonder your getting such good temps
Who needs nitrus freezing when its that cold outside.
Been thinking about building a plexyglass box, sticking my PC in it, and building a widow platform for it to sit on outside. My overclocks would resemble the outside ambient.