Question

How to find annual rainfall ?

Answer 1

After a year, the total amount of rain that fell on a certain spot is added up, giving total rainfall for that year. That total is added to the previous totals from years past, then divided by the number of years the records have been kept. For example, if a mountain gets 100 inches of rainfall the first year, 110 the second year and 90 the third year, the total amount of rainfall (300 inches) is divided by 3 years (the number of years recording) to "average" 100 inches of rain each year.

Answer 2

 Average annual rainfall for a place is generally calculated by averaging the last 30 years of annual rainfall. Annual rainfall is the sum of daily rainfall, that can be calculated from raingauge records. Here, while calculating average annual rainfall one must take the length of period into account.
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