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To those of you who send me emails - I apologize for not answering all of them. I simply haven't had the time or energy the last few years.
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From December 21 (2017) my OpenWeatherMap account will be suspended because the number of requests using my API key significantly exceeds the threshold of the free subscription that is 60 calls per minute.
If you need the weather sync you will have to use your own API key for now.
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<font color="#040">Forest Live Wallpaper</font> is a nice, relaxing wallpaper with trees blowing in the wind and a sky that changes from dusk till dawn.
Don't forget to go into settings to turn on things like weather, multisampling* or the 3D parallax effect*, if you don't wanna miss out!
* Not supported on all devices.
Troubleshooting
How do I use this wallpaper on my lock screen?
You need to have a lock screen that can use live wallpapers as background, like Locker Master or something. You might just need to enable it in the launcher settings. When setting a wallpaper on Galaxy S6, e.g., you choose whether to use if for your home screen, lock screen or both. The one in the screen shot is part of the ROM CyanogenMod.
There's a color setting called <font color="#88f">Night-time multiplier</font> that you can change to a brighter color, making the trees and hills brighter at night. It's not the perfect solution, but it'll have to do until I (eventually) add a fix.
Make sure you have a location set in the location settings, then check if <font color="#888">Recent weather data</font> (via the menu in the weather settings) is available, up to date and for the correct location. If not, the weather provider is simply not accurate, but now you can change the weather provider.