a simple rain gauge to record rainfall.
See the flash animation
a) a pair of scissors,
b) a sticky tape,
c) an old plastic bottle; and
d) a scale.
Cut an old plastic bottle in half and turn the top upside down to
make a funnel.
Make a scale and tape it to the side of the bottle.
Keep a daily record of how much rainfall you collect over several
weeks or even months, and make a chart of your own findings.