This is a fine weather in early winter. Is it cold or warm in winter?

If it is sunny in early winter, it will be warm all winter.

If the weather in beginning of winter is sunny, it means that there is less rain and snow this winter, and the weather is warmer and not too cold, which is what we often call "warm winter".

If the winter is sunny and warm as spring all day, it will be a good year and a very good weather for the poor who were short of clothes and food at that time. Because it's not cold in winter, they won't catch a cold because they don't have warm clothes, and they can spend the winter safely like rich people.