Young Meteorologist at the Tenderheart level has the girls observe and record the weather that they experience. Requirement #3 compares actual rain amounts to that of the average rain fall for your area.
To begin with, the girl needs to make a simple rain gauge using a can and a ruler. Then record the amount of rain received over two weeks time. Spring is a perfect time for this activity when rain is frequent.
To assist you I have created a printable worksheet for the girls to be able to record the rain on.
NOTE: The requirements have been greatly simplified here. Please be sure to read the full text in the Girl Handbook to make sure you fully understand the requirements.