Through the wetter, cooler months, the priority is the seal and the track - moisture works into both, and a door that drags on a dirty track in December will drag worse by February. In the drier summer stretch, the seals shrink back the other way, and that's when gaps under the door widen enough to let in actual draughts rather than just cold air. If you're in one of the closer-in areas like Minnehaha, Five Corners, or Hazel Dell, the swing between seasons tends to hit older rubber seals the hardest, since a lot of that stock sits toward the earlier end of the 1977-2011 build range. Further out toward Brush Prairie or Mount Vista, newer builds mean newer seals, but the same freeze-thaw cycling still happens - it just has less material to work on yet. Either way, a seal check twice a year, once before the wet season and once after, catches most of what causes the draughts people call about.