A weatherization system for a wellhead methane emission reduction system is described. The weatherization system reduces green-house gas emission into the atmosphere and reduces the effects of weather on the methane emission reduction system. The weatherization system includes a stack assembly connected to a housing of the reduction system by a housing adapter. The stack assembly includes a stack adapter and a stack cover, which collectively helps protect the methane emission reduction system and prevents weather or atmospheric factors from entering the housing. The weatherization system may include one or more sensors for measuring the effects of weather or degradation of at least one of the weatherization system and the methane emission reduction system.