Original Resource Pack: Alternative Rain Sounds by paoleks 

Original sounds used to create this resource pack:
https://pixabay.com/sound-effects/rain-and-thunder-nature-sounds-7803/
https://pixabay.com/sound-effects/soft-rain-ambient-111154/
https://pixabay.com/sound-effects/natural-thunder-113219/
https://freesound.org/people/bone666138/sounds/198857/
https://pixabay.com/sound-effects/thunder-24571/