At Thessaloniki, Greece for Thursday 19 Jan. there is an indication for 55cm of snow in your site.
For the same place and time, meteoblue gives 5,3 mm of precipitation (in snow form although the given temp, is +3C).
I think you must improove the parametrization as your program dont take into account the comma.
(5,3 mm of preci. = 53 mm of snow = 5 cm of snow).
Also with surface temperature +3C is more likelly the precipitation to be in the form of rain rather than snow (I believe the critical temp. must be +2C)

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