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| Technically speaking, rainfall is one of several types of precipitation, which includes all of the forms of water particles, whether liquid (e.g. rain, drizzle) or solid (e.g. hail, snow), that fall from a cloud and reach the ground. However, since rainfall is the most common form of precipitation occurring within Australia, the word is often used in general language instead of precipitation. Within SILO, for example, you will find rainfall maps, and daily rainfall data files, and not precipitation maps and data files. | ||||||||||||||
| There are a number of terms you may hear in a forecast or weather report describing precipitation, some of which can be found under Weather Words on the Bureau web site. | ||||||||||||||
| The current unit of measurement of precipitation is the millimetre. The old imperial system used the inch as the fundamental unit of measurement, which was subdivided into 100 points. Thus 1 mm is equivalent to approximately 4 points of precipitation. | ||||||||||||||
Use this tool to convert between rainfall units.   |
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Bureau of Meteorology (ABN 92 637 533 532). |
