Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain.
Raindrop Counting: Teacher claps a certain number of times ("thunder"). Kids listen to see how many times the teacher claps and they then put the corresponding number of clear flat floral marbles on a felt "cloud" mat.