I had my surgery in February, it was -40 when I left the hospital. Everyone was sick around me and I dodge all of it by staring them down. I was worried silly that I would get sick. Coughing and sneezing are 2 things that will hurt a lot.
I was more worried about getting sick in the hospital then I was at home where I could isolate myself.
Personally, no matter where you live, I think it is luck of the draw when you go for surgery as to catching a bug. The time of year makes no difference. The room beside me in the CVICU was quarantined, everyone going in had to be suited up. Ironically, they TV remotes were shared between rooms and they would put them in ziplock bags to prevent infections from spreading.