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How do we calculate average annual rainfall?

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Calculate the averages. Once you've recorded data of rainfall for a month using rain-guage, you can analyze your data and see overall rainfall trends. Adding up the rainwater of all 7 days in a week, then dividing it by 7, will give you the average rainfall of that week. read more

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. read more

An example of the complete calculation for a 10-year average monthly rainfall should look like this: 3.2 (inches of rain) + 3.1 + 2.9 + 3.7 + 2.9 + 4.1 + 3.5 + 2.8 + 2.9 + 1.7 = 30.8 inches of rain, divided by 10 years = 3.08 inches of average monthly rainfall. read more

Average annual precipitation is a vital piece of climatic data - one that is recorded through a variety of methods. Precipitation (which is most commonly rainfall but also includes snow, hail, sleet, and other forms of water falling to the ground) is measured in units over a given time period. read more

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