People get suspicious of brand new posters coming in with deep and searching questions! What was your ID before?
There was nothing unusual about the circumstances. It might have been a little colder than normal, but aeroplanes do actually operate in very cold climates all the time, and cruise for hours at extremely low OATs. Rather than simply ask, if you feel it's relevant, try a little research on your own to answer your own questions. Do you think all that wasn't examined right at the start?