Finland's low slopes are deceptive: mid-mountain at its resorts sits at just 200–600 m, and yet 8 of 10 are snow-sure at Christmas. A typical Finnish resort has seen snowy Christmas holidays in 26 winters out of 30 (1984/85–2013/14). In the Alps at that altitude there is barely any snow at Christmas; in the north, latitude counts for more than metres.
Lapland beats the south
For a Christmas trip, the safest bets are in Lapland. Pallas at 600 m has not missed a single Christmas out of 30, Levi at 400 m has missed one (29 of 30), and Ylläs has managed 26. Further south there is less snow: Ruka at 300 m sits exactly on the threshold, 25 of 30, while Tahko at 200 m manages 20. With snowmaking, all ten clear the threshold. The neighbours look much the same: in Sweden 26 of 34 resorts are snow-sure, in Norway 23 of 29. These figures describe the climate of past winters, not a forecast (methodology). The takeaway: for Christmas, pick Pallas or Levi; in Tahko roughly every third Christmas went by without natural snow.