I can easily believe that. I live in the cozy state of Minnesota, you know, we get that white stuff that falls and sometimes it is just too goddamn cold for it to fall 😛 If you have been in actual cold, not "oh my its cold out, i better grab a sweatshirt" you know what happens when you breathe. Your nostrils stick together 8O
I have my windows open right now and I'm running ambient of 14C. I am hopefully getting a water kit in the next two weeks and should see some nice temps. My D805 usually idles 4C over ambient and loads about 14-17 over.
What kind of kit are you running? My 7800 GT CO idles at 35 even when my ambient is in the 23-24 area. (stock copper cooler, fan at 20%)