--- " Im planing to visit japan on december first-second week of december. Where do you think I can find snow during the time? "
I think if you go to northen part of Japan, you will have snow.
So i recomend the area as below,
For your informqtion, I introduce the web site of turist gude or the place where I like.
Before going, please check there is snow or not and you can enter or not.
Depends on the year, the weather change a lot.
I hope you will enjoy Japanese beatiful snow(^^)/