Update January 17, 2019:
We were pleasantly surprised, even as the US government shutdown continues that the year end exchange rates were released yesterday. For 2018 the year end FBAR and 8938 US-Canadian exchange rate is as follows:
1 USD = 1.3620 CAD
Due to the current government shutdown the December 31, 2017 US-Canada exchange rates are not yet available. Check back soon for the updated rates. We will post them here are soon as they are available from the Treasury Department.