The official climbing season is 1 July to 31 August, although mountain huts at each of the ten stations on the various routes of ascent are open from April to mid-November.
Climbing season here starts in December and ends in April. 
mnli hypothesis: Climbing season here starts in December and ends in April.  premise: The official climbing season is 1 July to 31 August, although mountain huts at each of the ten stations on the various routes of ascent are open from April to mid-November.