Moisture in the atmosphere condensed into dew during the night.

大气中的水汽在夜里凝成了露水。

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If there is more moisture in the air condensing as dew, you might expect to see the effects high up and to windward, on somewhere like Mountain Red Hill.

如果空气中有更多的水分凝结成露珠，你就可能会在高处及迎风的地方看到其效果，红山就是这样一处地方。

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We might imagine that the saying works because on a dewy morning, much of the atmosphere's moisture has already condensed out as dew, so there isn't a lot left over for a rain storm.

我们也许会这样想，早晨的露珠已经把空气中大量的水分凝结成露水，所以没有足够的水分产生暴雨。

youdao

If there is more moisture in the air condensing as dew, you might expect to see the effects high up and to windward, on somewhere like Mountain Red Hill.

ECONOMIST: Ascension Island