> Rainfall and rain harvest Calculator

This rainfall calculator will work out what your expected 'rough' average monthly rainfall should be from the nearest measuring stations for which we have publically usable data. This can then be used as a basis to work out how much can be collected and hence rainwater tank capacities. If anybody has rainfall data they would like to contribute to this service, please let us know.

Values for your location

Values for your roof


Remember, the values calculated here should be taken as a rough guide, it does not take into account other effects and has a very limited source data set.

Reset & do another calculation.

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