This actionscript code can be utilised to get a rain or snow effect in flash, you can add some wind or other features for more reailstic visualty. My source Files uses this code to make a “raining star” effect. If you need help about this example, feel free to leave your comments here. [Edit] Because of the lots of, realistic snow effect requests, i worked on it and you can find the example below. If you want to use weather effects (rain, snow, wind, autumn and etc.) in your own works, just click here and get them for $1

 
//@Created By Eser Yogurtcu
starNumber = 40;
for (i=0; i<starnumber;>
newStar = star.duplicateMovieClip(“star”+i, i);
newStar._x = Math.random()*Stage.width;
newStar._y = -Math.random()*300;
newStar.maxStarSpeed = Math.random()*4;
newStar.alpha = Math.random()*60+40
newStar.onEnterFrame = function() {
this._rotation -= this.maxStarSpeed+1;
if(this._y&gt;Stage.height){
this._y = -Math.random()*300;
} else {
this._y += this.maxStarSpeed+1;
}
this._alpha = this.alpha;
};
}</starnumber;>