what is different between annual rainfall and mean annual rainfall
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normal or average rainfall is the amount of precipitation that we expect per year (in a given area). it is obtained and set by calculating the average (mean) of precipitation recorded in an area during many years ( at least 30 years). Annual rainfall or precipitation is the sum of daily rainfall in a year.
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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. One cannot simply average the 10 years of data to state the average rainfall. It has to be 30-35 years.
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