Good question Mike...
... but coming from you, that wasn't a surprice.
Yes, judging the height during flare can be difficult under certain light-conditions so there's a definite danger for white-out.
Therefore, there's placed RWY-edge markers along the length. These are simply branches which are cut off from nearby trees and put down into the snow.
On this pic, you can barely see them around midfield:
On this pic, they are alittle easier to spot:
When you land in sunshine, the contrast and shadows makes it much easier to flare (like the top pic) but when there's an overcast (no sun), then there's a definite advantage with the branches.
And I can gurantee you, that if/when you get up here, you'd trade those sandals and shorts of yours for the right wintergear at any price!
Just any any of the Canadians on this forum...
OOOPS! Hope I'm not hijacking this tread now....