Google seems to be trying its hand at a lot of things these days. And you can now add 'weather control experiments' to its list of success stories with the company's latest Easter Egg.
Just do a regular old search for "let it snow" and then sit back with a warm mug of hot chocolate and a crackling fire. If your browser window gets too frosty, the blue Search button at the top should switch to a Defrost button after a while.
Once your screen gets completely fogged up you can also draw on the Google search results page like a finger on a window.