From Josh Morony: "I keep going on about how important atmosphere is in a game, and the last two Phaser tutorials I have created have focused on that. First we learned how to create a parallax background effect which adds more depth to a game, and then we learned how to create a day and night cycle so that the game would transition from day to night and repeat that process over and over.
This tutorial is again going to focus on adding some atmosphere to your Phaser games, this time by adding weather effects to the game. We will be creating both a fog effect and a rain effect. Once again, this tutorial series has been inspired by the game Alto which also does a spectacular job at creating atmosphere with weather."