You’d need to get the North Winter season pack for that. There is one pack for each season. But you must only install one at a time, clear rolling cache and restart sim.
The current state of affairs sees the farce of a snow-capped Mt Teide in Tenerife surrounded by green palm trees and brown deciduous the whole way up even above 1500m and no conifers. The content creator has already rectified this week’s ago, but the lack of updates keeps the sillyness going.