The top end of your scale is about right, 40C is 104F, which I do believe as you, is too damn hot, however, I'd put the -10C into the biting cold category, and -20 is simply too cold to go outside. 0 to -9 is the normal winter day and anything slightly above freezing is mild winter.
That depends entirely on where you live, my friend. Here in Norway, some schoolchildren will happily walk to school in -20C on a daily basis during the winter, where I currently live -10C is pretty cold but yet quite normal and certainly doesn't inhibit daily life. And don't even get me started on these wimpy "snow days" that seem to play such a large part of American children's hopes of getting off school.
I'm suing my lawyer since I lost my last case!
Sadly, that happens more often then one would think.
Windows and Mac OS provide a devoloper with a guaranteed stable platform development-wise, and as such are much safer bets.
Pretty much every major release of Windows or of OS X is guaranteed to break someone's application. More stable than Linux? Maybe so. Really, truly stable? Not so much.
Quite true, but that brings us to another of Linux's double-edged swords. Windows and Mac OS have many years between each monolithic release, whereas typical distributions make new semi-major releases twice a year. Great for geeks like me who like the bleeding edge, another headache for developers who have to cope with constantly shifting goalposts.
8 Catfish = 1 Octo-puss