Hi, it’s possible that this is a similar explanation as rain:

I haven’t checked it with snow but if Windy doesn’t show the snowfall below 0.1cm, that might explain this inconsistency. I will check that more carefully.

I seem to remember that the ECMWF model transforms rainfall into snowfall at low temperature with the ratio 1mm of rain = 1cm of snow, or 0.1mm of rain = 0.1cm of snow. And you know that 0.2 cm of snow is about nothing.