Snow, anyone?

Had an ideer today (compliments of the recent snow we've been getting here, prolly :p )

SH3Commander has an option for wave height as 'seasonal'. Could not snow be modelled as texture like rain is, and have Commander have a 'precipitation' option for seasonal as well? So that if you select seasonal, during certain months (for example, December through March) and in certain zones instead of getting rain you get snow?