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Depends where you live. Here in British Columbia -45c feels like -45, but on the prairies, -45c feels much, much colder because they get wind. Take another 10 to 20 degrees off of that to get an idea.
I remember growing up in a burb of Milwaukee seeing a bank thermometer showing +110F/43C, but I bet I have experienced hotter either when I lived out in CA (trips to desert) or my time in Rio.
I do know it also hit -26F/-32C in the same burb of MKE when I lived there.
I don't think it does such a big difference if it's -30, -35 or -40C. Already around -27C it becomes difficult to comprehend the temperature, as your senses become numb while your system uses most of its energy to keep you warm, and it starts to be harder to breathe. The last time I experienced such temps was in Tampere in 2007, and remember feeling like in some kind of trance when walking to the store. The extremely cold air felt different than normal, the only thing I remember thinking of was the cold, and felt some kind of disorientation.
-20C again feels way different. Of course it's very cold, but you react to it in the same way as to -10C.
After saying this, unlike some people believe, -30C is no way a dangerous temperature to you if you're dressed up properly. The only danger is that when your senses are numb, it's harder to feel a possible frostbite. Long time exposure demands a lot of calories and may affect your sleep, but that's about it.
Highest Actual temp : Beijing,China 37c(98f) July 4th,2013: Miami,FL June 22,2009 98f(37c): Miami,FL July 3,1998 98f(37c).
Highest heat index: 110f June 22, 2009 Miami,FL
Coldest ever temp: 15-20f January 2009 camp kulaqua(High Springs,FL).
I don't think it does such a big difference if it's -30, -35 or -40C. Already around -27C it becomes difficult to comprehend the temperature, as your senses become numb while your system uses most of its energy to keep you warm, and it starts to be harder to breathe.
Oh man, I start experiencing numbness and difficulty breathing around -5C. Physically I can't tell much difference below -10C. But environmentally I can notice the ice crystals in the air around -20, -30. Which is a dead give away that it is freaking cold.
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