Use the metric system enough and you won't have to translate and when it is -40F it is also -40C. Since most of industry in the U.S. has been using the metric system for the last 40 years and more it makes sense to change everything so there is only one system to know. I can just as easily frame a wall with a 5x10 or 50 x100 as I can a 2x4 and I would be less likely to make measuring errors. As for moving, the answer is no, but Canada would be my first choice.
We just got done with our cold blast...resulting in -37F with a wind chill of -60F or more!
I can tolerate going outside for a few minutes when the temps are in the 20s (but I also have some additional "insulation" on my body) and for up to 30 minutes or more when the temps are in the 40s. All of this is typically when their isn't much wind to bring the temps much lower. No matter what, though, I will sleep in the nude and spend my morning time in the nude as I am now while typing this.