Good landclass also helps with desert phenomena. There is at least couple of options for Europe landclass, from Cloud 9 and SceneryTech. OpenVFR landclass is nice option too, though they offer it for one country at a time, not whole continent. Adding Good landclass improves hugely other terrain features too like shorelines, autogen placement and roads. I am satisfied with my scenery using Cloud9 landclass and Leclerq textures as my "default" scenery. Improvement over default is huge. And no desert Europe to be seen anywhere.
By the way. Cloud9 practically disables seasonal textures by default, but it can be easily changed so that seasons appear again.