No you can't, it just turns the background yellow.
EDIT: the snow stops _but after a few seconds_. I toggled it to find out if it would turn off the snow, and the immediate feedback was that it doesn't. That's really _really_ bad UX.
It's not a "reminder" for people who've never been to the site before. Especially not when the icon isn't even visible on some devices, like my phone in portrait.
