No, Anonymous is about right: Environment Canada shows the actual temperature as between -27 and -31, with the windchill dropping the felt temperature to -37 to -47 (I'm not sure what time the protest was). If it hit -45C, then it was -50F (which you possibly knew, but I always have to look up!)

That's from here (http://www.climate.weatheroffice.ec.gc.ca/climateData/hourlydata_e.html?timeframe=1&Prov=MB&StationID=3698&Year=2008&Month=2&Day=10), because you mentioned Environment Canada. I was pleased to see that they included windchill, because a lot of records don't, it seems.

February was frigid, and I have the heating bill to prove it. ;)