Lots of fun lesson ideas in this post on "Weather Week"! When teaching weather and the water cycle consider picking up a copy of Sydney and Simon: Full STEAM Ahead! by Paul A. Reynolds and Illustrated by Peter H. Reynolds.(Available this September!)
I wish I had lessons like this when I was trying to learn :) Great activity during a weather unit. 2 liter soda bottle cut in half. Put about an inch and a half of warm water (w blue food coloring) in the bottom. Invert the top of the bottle with the lid on and fill with ice. Watch the water condensate and watch it "rain" THIS is brilliant!