Probably -27ish

"How are you not cold? Do you have really good clothes or are you just used to this?"

"Probably both", I answered, laughing.

But it's just so perfect, a night warmer than -30 with not a trace of cloud, and no shyness from lady aurora. I couldn't help but to stay out there all night. It's just getting back into the car with a neck warmer covered in frost melting faster than arctic sea ice these days is a little disgusting.