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It rained on nineteen days in thirty. The garden still went dry.
A month that felt wet, measured properly. The rain arrived on two days in three and the garden lost nearly twice what it gained.
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How much rain is enough? The number is about 1.5 millimetres.
Below roughly a millimetre and a half, rain wets the leaves and the surface and evaporates without ever reaching a root. Everything this site says rests on that one number.
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A normal August in London brings 59mm. One brought 0.9mm.
Thirty years of rainfall for 201 towns, and the thing that stands out is not how much falls in an average month. It is how little an average tells you.