I thought it might be interesting to look at the degree day graphs (daily) for London, Ontario (very near randen) and Zwolle, Neatherlands (possibly near Marc_NL):
Heating Degree Days (daily) for Zwolle, Neatherlands
Heating Degree Days (daily) for London, Ontario
The things that jump out at me are the differences in the "depth" of winter. In other words, the amount of heating that would be required in each location. The other thing I see is the amount of variation in heating requirement for each location.
[* EDIT: I also added the HDD chart for Portland, Oregon. *]
Heating Degree Days (daily) for Portland, Oregon
Best,
-AC