Do the ski areas have a high probability of snow?

The following is a list of ski areas, their altitude and snow cannon coverage.
Austria
 
Brandnertal Vorarlberg
904 - 2.000 m, snow cannons on 75% of the ski slopes
Chalet Matin Vorarlberg
904 - 2.000 m, snow cannons on 75% of the ski slopes
Hochmontafon Vorarlberg 
650 - 2.300 m, snow cannons on 46% of the ski slopes
Katschberg Carinthia
1.065 - 2.220 m, snow cannons on 100% of the ski slopes
Bad Kleinkirchheim Carinthia
1.000 - 2.055 m, snow cannons on 97% of the ski slopes
Rehrenberg Salzburgerland 1.003 - 2.200 m, snow cannons on 90% of the ski slopes
Switzerland    
Alpine Lodge Lenzerheide
Graubünden
1.230 - 2.865 m, snow cannons on 38% of the ski slopes
Vierwaldstättersee 
Central Switzerland
1300 - 1.922 m, snow cannons on 30% of the ski slopes
The Czech Republic
   
Marina Lipno 
South-Bohemen
760 - 900 m, snow cannons on 100% of the ski slopes
Germany    
Winterberg
Sauerland
668 - 840 m, snow cannons on 70% of the ski slopes