I have came across this great tutorial about Weather effects by valdarko and I said to myself It should be better way to do this with particles.
So I start to investigate and quickly I have realized that I was right. Using only Construct 2 particle effects I was able to do the same thing. In my opinion this method is easier to setup and (by documentation) it should be less CPU intensive too.
First step was to setup a simple scene with two clouds. One for snow and other for rain.
Finding right properties for snow and rain particle effect took me some time and here are setup for both:
After that I have added two clouds with sine behavior like this:
And here is the final result: