Can you help me with some problems in Make-it-rain project?

Hi, I'm having two little problems:

1. I'm trying to make the rain fall, but it isn't working 

2. The Oh Noes guy says that ___env___ rainY.push is not a function

This is my code:

var rainX = [random(0, 400)];
var rainY = [100];
var rainAcc = 4;
var newRain = 350;
var cloudX = 0;

background(204, 247, 255);

noStroke();

fill(117, 156, 235);
for (var i = -1; i < rainY.length; i++) {
bezier(rainX[i], rainY[i] - 15, rainX[i] + 15, rainY[i] + 10, rainX[i] - 15, rainY[i] + 10, rainX[i], rainY[i] - 15);
}
rainY+=rainAcc;
rainAcc++;
i++;
newRain+=1/75;
if (rainY > newRain) {
rainX.push(random(0, 400));
rainY.push(random(-100, 0));
newRain-=1;
}
if (rainY[0] > 400) {
rainY = 0;
rainAcc = 4;
rainX = random(0, 400);
}

mousePressed = function() {
fill(117, 156, 235);
bezier(mouseX, mouseY - 15, mouseX + 15, mouseY + 10, mouseX - 15, mouseY + 10, mouseX, mouseY - 15);
rainY.push(mouseY);
};

for (cloudX = 0; cloudX < 440; cloudX+=50) {
fill(255, 255, 255);
ellipse(cloudX, 0, 90, 100);
}

Thank you! :D