Of all the major French resorts with relatively high slopes, Serre Chevalier has the most trees.  This makes it one of the most weather-proof resorts in the Alps and significant disruption due to adverse conditions is very rare.

Although Arc 2000 often has the best snow in the area, Peisey-Vallandry is the place to be in a storm thanks to its many long tree-lined runs.  These runs are very accessible from Arc 1600 and Arc 1800, but less so (in bad weather) from Arc 1950/2000 as links are prone to closure.

The local north facing slopes of Montchavin–Les Coches offer an impressive 1000m vertical of heavily wooded slopes that are a great asset in bad weather when the higher purpose-built parts of La Plagne may be experiencing a whiteout. 

La Tania is the best resort base in the 3 Valleys in bad weather. Its north facing local slopes are thickly wooded and offer options for all abilities. Once skies clear, access to the rest of the area (Courchevel, Val Thorens, Meribel) is also straight forward.

Vars/Risoul is probably the highest of all Alpine areas to offer extensive woodland terrain. These southern French resorts are ideal in bad weather yet are rarely short of snow.

La Thuile shares an extensive area of snow-sure skiing with La Rosière in France, but has the vast majority of the trees, and makes much the better base in bad weather.

Madonna di Campiglio gets more snow than the resorts in the nearby Sella Ronda (Selva, Arabba), yet still boasts excellent snow-making and plenty of trees in case of bad weather.

Selva and the Sella Ronda offer plenty of trees for bad weather days.  They also have some of the best snow-making facilities in the Alps to combat an erratic natural snowfall record.  On-piste, at least, snow cover is highly reliable and there is normally plenty open, even in the roughest of weather.

Nearly all of Schladming's terrain is wooded, and its low altitude is less of a problem than in other Austrian resorts due to its shady north facing slopes and excellent snow-making.

Given its northerly latitude, it is not surprising that Åre has highly reliable snow cover.  Its upper runs can be windswept and prone to closure in poor weather, but lower down there are lots of trees so Åre can be considered a good weather-proof resort.