For @BlueBacon
As a carry over from the other thread so I don't hijack it too much....
The Australian SAS came to do high arctic training in Nunavut one year in Jan....it is 24 hr darkness there that time of year...we staged at our base before we deployed and these guys showed up with their version of arctic gear which was not anywhere near the capability they needed so we kitted them out....
We got on board C-130 for the 10 hr flight.....once we got to our location at the remote airstrip, the ramp was lowered and the real cold came to be a reality....we had indigenous northern rangers as guides and support staff (and it was a good thing).
The rangers put the Aussies through their paces , teaching them to make igloos and shelters as well as fighting positions.....along with how to watch for polar bears which would often patrol around our camps in total darkness.....
Their commander was in awe at how short of a lifespan any batteries had if exposed to the cold...we carried our batteries under out parkas to keep them warm, put them in our device, use it and then take them out to put under our parkas.
He said he often heard about the Chinese or Russians invading Canada through the Arctic and after being there scoffed at this thought......the vastness and outright nothingness would negate such an invasion. We told him they would be after resources and not military targets so this would be more of a civilian based invasion more than a military one...they would most likely send a force protection though....
I never saw any group of people so happy to get out of the cold ever before.......the sad part of it was, it was cold at our home base in the middle of winter too....I think they were more happy about not having to carry around a bag of frozen human feces more than anything.....
I didn't go to Australia for the next joint exercise but I heard they pulled out all the stops in an attempt to make our guys as miserable as possible....
Coldest I have seen was -20* F in Iowa. That was the year I discovered block heaters...