David Thiel wrote an answer about The North Face Arctic Down Parka - Women's on September 14, 2014
Coats don't have temperature ratings because people do different things while wearing them...
BUT.... No. Despite its name, this not really made for that sort of temperature extreme.
Tell us all a bit more so we can help. -40 is a pretty cold temp--and not the sort of thing you'd regularly encounter unless you were on a trip/expedition (..or live in the arctic circle... at which point I don't think you'd be asking!)
What are you planning? Would help to know what activity you'll be doing at that temperature? And where?