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The place to discuss incubating, hatching and rearing chickens.
I would imagine that the humidity level under a broody would be a lot higher than you would initially think. There is very little in the way of air gaps under a broody bird for either moisture or heat to escape. For a (poor) comparison, remember how quickly the old telephone boxes would steam up once you shut the door.
I've read both tales Marigold, about the broody walking through dew soaked grass and nesting on a damp turf. They are both in L Wright's book The Practical Poultry Keeper. He advocates having a nest box with no base, sitting on the ground, and recommends scraping a hollow in the earth before putting in the straw. It was this book that gave me the idea for "droppings board" 3 inches under the perch in my big wooden house.