Blizzard by Carole Gerber, illustrated by Marty Husted (Charlesbridge, 2001).
I found this book on display at the local library. I love how it evokes both the coldness and warmness of winter. The boy contrasts the cold winter weather outside with the warm coziness inside his home. He goes out and plays in the snow at night and then comes back inside where it's nice and warm to go to bed. The watercolor and colored pencil illustrations are soft and lovely.