many books refer normal rainfall as annual rainfall average of consecutive 30 years while other refer average annual rainfall as annual rainfall average of 30 or 35 year consecutive years. are the two same or different?
no annual rainfall is the sum of 365 days in a year and average annual rainfall is the average (mean) over the years.
annual rainfall is that ok. but what is difference between normal annual and annual average raifall?
"Normal" precipitation does not equal "what you should expect." "Normal" precipitation to a meteorologist is an average of the precipitation values over a 30-year period. Precipitation may very often be either well above or well below the seasonal average, or "normal."
The two terms mean the same thing but different from annual rainfall.
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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