Deep fog?

This is one of the subdivided phrases from the solar terms system allocated to the middle of August, in other words, in the midst of the lingering summer heat.

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Although I learned it meant “deep fog shrouds the world” I don’t associate fog with the heat around this time.

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I just wonder if my distant relatives living in the mountains of the central part of Kyoto Prefecture may understand this sense of the season very well.

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