You are working for the meteorological department in hawaii. your job is to keep track of the rainfall that 50 sites across hawaii receive through the year. what type of statistical study is this?

We are staying in the meteorological department where we are required to keep track of the rainfall  of sites across Hawaii. The statistical study used is observational study which just makes use of the readings of the level of rainwater falling. From this, we can deduce the average level after raining.