First, what model do you use ?
If you use the default model in Windy, i.e. that of ECMWF, its resolution of 9km cannot give an accurate information in mountains. Resolution of the model is the data grid spacing, like in photography, a poor resolution cannot give a nice picture.
For snow depth use the ICON-D2 model with a 2.2km resolution

For other parameters like temperature, use AROME-HD (unfortunately not available for snow depth).

AROME-HD 1.3km resolution with customised temperature color scale