The yearly rainfall average is a vital piece of rainfall climate data. It is recorded through a variety of methods. Precipitation includes rainfall, snow, sleet, hail, and other forms of water falling to the ground and is measured in units over a given time period. Precipitation is commonly shown in inches per twenty four hour period in the United States. If four inches of rain fell in a twenty four hour period and the water wasn’t absorbed into the ground nor did it flow away downhill, then there would be a four inch layer of water covering the ground. In other words, it would have been raining cats and dogs.

Rainfall was the first weather element that was ever accurately measured. It isn’t known who measured it first or where the first rain gauge was used. Since nothing more than a bucket and ruler are required to get accurate rainfall data, it’s easy to see how this could have been done many hundreds of years ago. History shows that the Greeks kept rainfall records as early as the 5th century B.C, though they never had a measurement for when it was raining cats and dogs.

In order to measure rainfall precisely, the gauge should be located out in the open and away from tall buildings, trees and any other obstructions. Inaccurate measurements are taken if the gauge is too close to large, impeding objects. The science behind the gauges isn’t totally precise, as water that is blowing or falling off of structures can enter the gauge, showing that it was raining cats and dogs when in actuality, it was only a moderate rain shower.

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