Take an empty glass jar, and make sure it is completely dry. Place a 6cm plastic ruler inside so that it touches the bottom of the jar, and the calibrated side can be seen through the glass. Tape the ruler in place in a way the tape won't come off when it gets wet.
Now stand the jar outside, taking care to place it somewhere that it will catch the rain, but won't get blown over. The children can make a note of the date and time they placed the jar outside.
One week later, they can collect the jar and measure how much rain has fallen. They will need to take off the few extra millimetres at the bottom of the ruler, which they can do by subtracting them from the final measurement.
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