In that case, your right. It's hotter than Tibet since the average altitude is around 4000m. Lhasa is 3500m high and it's low compared to the rest of the region.
About the simplification:
Ice and tundra are pretty obvious
The cold is for all the Dd and Dc climates. We already established that the difference between w,f and s was marginal because it's too cold to ever become dry. Dc is packed together with Dc simply because Dd is very marginal by itself. On the northern edge, it's the tree line but the southern portion is made of a dense conifer forest (almost exclusively). Agriculture is almost impossible except for the southern edge (having snow in the end of may is nothing uncommon in these area, although it usually melt after a few hours).
Temperate is actually not the only temperate climate, that is a temporary and subjective name (like most of them). For example: a subtropical make sense when it's close to the tropic, not when it's in the mid latitudes (45). Anyway... this includes all the Da and Db climates except Dsa and Dsb that are Mediterranean (or west coast) climates. The difference between Da and Db is that Da is hotter, of course. Cfb have milder winters and usually summer are a bit cooler than of Dfb. The difference is not always that large and the vegetation is not too different. Maybe Dfa should be with the subtropical instead ?
Subtropical is for Cfa, Cwa, Cwb, Cwc. Freezing temperature are almost nonexistent although they do have a colder season. these areas are often affected by the monsoon and can have long dry periods. Some places like Japan receive a large portion of their precipitation with tropical storm/cyclone.
West coast is for Csa, Csb, Csc (yep I have them on the map now) Dsa, Dsb (only in Turkey,Iran, Central Asia). Not sure but it look different enough to have it's own category.
desert and steppes...
Dry forest is for forests with a dry season. Unlike the subtropical climate, the dry season has a large impact on the fauna and the flora and there is no cold season.
Equatorial is for forests with little to no dry season. Very little variation over the year : always hot and humid. Very high diversity and complexity. Low adaptability to climate changes.
As for the colours, I started with this map: http://upload.wikimedia.org/wikipedi...Vegetation.png
but I thought the colours clashed too much (especially in the CWBP2 map), so I changed them and fused some of the categories (too many for the arid climates).