On this one, I think Lucy is right

Up here on the 8th floor, the snow definitely seems to be coming up.

LUCY
And way up there,
The little stars and planets,
Make the rain,
That falls in showers.
And when it's cold and winter is upon us,
The snow comes up,
Just like the flowers.

CHARLIE BROWN
Now, Lucy, I know that's wrong. Snow doesn't come up,
it comes down.

LUCY
After it comes up, the wind blows it around so it
looks like it's coming down but actually it comes up
out of the ground- like grass. It comes up, Charlie Brown,
snow comes up!

CHARLIE BROWN
Oh, good grief!

"Little Known Facts" from You're a Good Man, Charlie Brown, lyrics by Clark Gesner, ideas by Lucy, Lucy by Charles Schultz.