As much as I hate the weather app myself, this isn't an equivalent solution. The weather app shows the temperature in the taskbar itself, without opening anything. Also, I don't keep my browser open 24/7, so it's more than just loading a single extra tab, you need to wait for the browser process itself to start up.
If you want to load weather in a browser from the taskbar instead of having it available without having to open another application, I'd recommend using dillo or some such to load wttr.in or similar. A single http request that loads fast from a comparatively simple application that also loads fast. You might even be able to load it as a .hta file.
If you want to load weather in a browser from the taskbar instead of having it available without having to open another application, I'd recommend using dillo or some such to load wttr.in or similar. A single http request that loads fast from a comparatively simple application that also loads fast. You might even be able to load it as a .hta file.