Snow

snow.coverage_nrel(snowfall, poa_irradiance, ...)	Calculates the fraction of the slant height of a row of modules that is covered by snow at every time step.
snow.fully_covered_nrel(snowfall[, ...])	Calculates the timesteps when modules are fully covered by snow.
snow.dc_loss_nrel(snow_coverage, num_strings)	Calculates the fraction of DC capacity lost due to snow coverage.
snow.loss_townsend(snow_total, snow_events, ...)	Calculates monthly snow loss based on the Townsend monthly snow loss model.