The North Coast of Quebec in Late January - What Could Go Wrong?

I'll be spending the last week of January on the lower North coast of Quebec, about 400 miles North of Quebec City.

I've lived in Tucson since 1981.  I'm not sure my system will be able to deal with daytime high temperatures of, oh, 21°F.

I just ordered quilt-lined bib-overalls from Carhartt off of Amazon.  Now I need to get some long underwear, heavy socks, and some heavy long-sleeve shirts.  I get the feeling I'm going to be spending some quality time tramping around the jobsite taking pictures and notes.

Engineering.  It's not just a job, it's an adventure!  Can't keep me in a fabric-covered box! ;-)