You may have heard the term “it’s raining cats and dogs,” and knew that if you stepped outside, you wouldn’t see Fluffy or Fido falling from the sky. Instead, you know that the term means it’s raining heavily. Rainfall is measured in inches and fractions of inches. A sprinkle is generally one tenth of an inch of rainfall or less per hour, while moderate rainfall is from one tenth to one third of an inch per hour. When it gets heavy and soggy is when it falls at a rate that is over one third of an inch per hour.

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.

Meteorologists and weather observers use more sophisticated instruments, like electronic rain gauges and tipping buckets to more precisely measure rainfall amounts. A rain gauge should have a wide opening at the top for the rainfall to enter. The rain falls into the container and is funneled into a narrow tube. Because the tube is thinner than the top of the funnel, the units of measurement are further apart than they would be on a ruler to allow more precise measuring, down to the one-hundredth of an inch. If less than one-hundredth of an inch of rain falls, that amount is called a trace of rain. If three inches of rain falls, then it is said to be raining cats and dogs.

Beth Kaminski is the co-author of Curing Your Anxiety And Panic Attacks which detailed cure panic attack cures as well as tips on the various anxiety attack medication available at anxietydisordercure.com.

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