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?
"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."