Perth Rainfall

Perth's average rainfall is around 790 mm. a year. The pattern is for high rainfalls from May to August- almost 70% of the year's total rain in four months.

Here's how to calculate how much water you can collect from your roof. Take the number of square metres of roof, muliply by the number of millimetres of rainfall, to give the number of litres. e.g. If you have 150 square metres of roof, and the average Perth rainfall is 790mm, then you could collect over 110,000 litres a year.

A 10mm rainfall would yield 1500 litres! In both cases, it's safest to subtract 10% to allow for absorbtion, evaporation etc.

In Perth, it certainly makes sense to have a water tank installed in time to catch the heavy rainfalls mid-year. Then you're ready for those long, hot, dry summers!

For your information, here is the official Perth monthly average rainfall graph, together with the average number of rain days, supplied by the Bureau of Meteorology.

If you live in Perth (or elsewhere in Western Australia), we'd like to help you with your water tank requirements. Learn more at our Perth Water Tanks page.

Thinking about a water tank- your own, personal water supply? Visit our Water Tanks for Perth page.

For enviro-friendly tips and news, be sure to and please, tell your friends about us!

Call Enviro-Friendly today on (02) 6282 6266, and find out how we can help you
"Save water, save energy, save money, and save the environment."

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