At that time of year it will be cold which will mean that wild camping might not be too pleasant temperature info
Also, there will not be much daylight [/url]. In the region of 9 to 10 hours. This means 14 or 15 hours of darkness. That would be a lot of time to spend it a tent. It also means that you would need to make the most of every daylight hour for riding to get your 100 miles per day done at a comfortable pace.
It is not impossible, but it doesn’t sound like it would be a pleasant trip. As Gary_M suggests, you might want to consider a different time of year.