You may want to try this clock and weather site specifically designed to Kindle:
https://0111.github.io/Kindle_WeatherCN/
The configuration page (which comes up in English on my computer) is
https://0111.github.io/Kindle_WeatherCN/config.html
The weather uses Openweathermap so the "API Key" is a request for a key from that site (which is free).
I found this on GoodEReader (at
https://goodereader.com/blog/electro...oogle_vignette).
I went through the code quickly and it doesn't seem to include anything scary.
No promises, though.