Adding weather, like rain or snow?

Newbie & Debugging Questions
#1

I have been trying to add weather to my java game, but I just can’t seem to crack it? How would I go about adding rain or snow to my game? I had in mind how weather is in pokemon games.

#2

In pokemon games the weather is merely an animation overlaid the entire screen. No particles involved, merely a looping animation.

#3

The way I did it was having an image and moving it repetitively down the screen.
You could use a ParticleSystem as well.

Also see:

http://www.java-gaming.org/index.php?topic=26424.0