Thanks and best wishes to you too.
I can imagine it being somewhat confusing, so I'll try to explain.
Our (Dutch) season map looks like this: 01.01:winter/02.01:naked/03.20:spring/06.21:summer/09.23:autumn/11.15:naked
From the FAQ on YoWindow you can see:
When the temperature less or equal to -5°C (23°F), winter season displayed.
When the temperature is more or equal to +5°C (41°F), YoWindow thinks that all the snow has melted and displays naked season instead of winter.
So, at Christmas time our landscape was naked. It had to be -5°C or less to show the winter landscape, but most of the time it was above -5°C.
Now, today, we have passed the 1st of januari, so YoWindow will show us winter landscape, UNLESS the temperature will be +5°C or higher, then it will show naked again.
Since it is (still) not possible to have a history of weather saved somewhere, it is for YoWindow not possible to 'see' what weather we had for about 2-2,5 hours ago, let alone longer ago, like yesterday or last week. Therefor whether we had snow or not, being it a little or a lot, YoWindow can only look at the present situation, which gives us the temperature as it is, not knowing if there is (still) snow on the ground.
Since it's somewhere between 0°C and +5°C at the moment, it chooses the season map, which gives us: winter.
I hope this clearifies it a little bit for you.
If not, please let me know.