Add all variable names.

climax/core/constants.py

@@ -4,7 +4,7 @@
 # -*- coding: utf-8 -*-
 
 # Cordex variables
-CORDEX_VARIABLES = ['tas', 'tasmin', 'tasmax', 'pr']
+CORDEX_VARIABLES = ['tasmin', 'tasmax', 'pr', 'orog', 'snc', 'snd', 'snw']
 
 # parameters defining a Cordex climate simulation
 CORDEX_PARAMETERS = ['Variable', 'Domain', 'Gcm', 'Scenario', 'Ensemble',