Well, I thought that there was a thread on "Does Bigfoot Migrate?" but if so it's been closed down or I can't find it. In any event, here is statistical evidence that suggests that the answer is yes. (Sorry about the size.)
This is a statistical breakout of the 232 encounters (howls, tracks, sightings) I've identified to date in New England and Canada east of the St. Lawrence River. There's actually over 300, but when you take out the ones that are known (or very likely to be) hoaxes and those without useful data as to location or season (or even year), you're left with only 232.
The "N41," "N42.20," etc., refers to latitude. From the southern tip of Connecticutt (N41) to the northenmost tip of my section of Canada (N47; yes there is a big chunk more in Quebec and New Brunswick, but there are only two reported encounters north of lat N47) measures 6 degrees or a little over 480 400 surface miles. I broke this area into five bands of 1.20 degrees (roughly 80 miles) and broke out the encounters north of each listed latitude line, but south of the next latitude line. What you end up with, in looking at the data, is that the further north you go, the fewer encounters that are reported in the winter.
I myself was curious as to why there was a seasonally consistent number of encounters between latitude N43.40 and N44.60 and also as to that number did not drop off as steeply as the other groups.
There is a remarkably logical answer based on geography and elevation. I'll pay for a year's premium membership to anyone who reads my mind by naming two points that define that geographic corridor and why its significant.