Here are my specs,
Windows 10 Professional 64-bit (up to date)
16GB (8x2) HyperX Fury DDR3 1866Mhz RAM
AMD FX 8350 stock clocks
MSI Radeon RX 480 Gaming X 8G (19.5.1)
MSI 990FXA Motherboard (latest BIOS)
The Elder Scrolls of Skyrim is still experiencing low FPS and GPU usage in a lot of areas with the RX 480 (19.5.1 driver) and CPUs such as an i7 870 and FX 8350.
The screenshots that I am attaching is at the entrance of Whiterun, in-game weather conditions does not have an influence on the FPS drop. The GPU can easily handle 150FPS+ in this game, but again it seems to be possibly driver related in certain areas.