I pulled the below off of the Environment Canada Website. This is a snapshot of approx the same time last year as the trip is planned for.
Max Temps of 27 Dec C, and a Low of 5 Deg C. This is based in Gander Newfoundland, so about the half way point.
Please click the below link to see the data.
Also take a look at the rainfall…. Of the 15 day snapshot I took, it rained for all but 6 days….. Bring the rain gear for sure. Oh and good thing we are going west to east as the wind gusts are pretty high as well..