This is the 17277th most frequent Russian word.
сухом
"Сухом" is the prepositional case form of "сухой," meaning "dry" (used in specific contexts).
The word 'сухой' in this context describes the physical state of the bread.
Этот хлеб слишком сухой.
This bread is too dry.
Here, 'сухим' refers to the characteristic of the climate, indicating lack of moisture.
Климат в этом регионе бывает очень сухим.
The climate in this region is often very dry.
The word 'сухом' describes the condition of the asphalt, emphasizing its dryness.