Answer
The boundary between humid and dry climates cannot be defined by a single rainfall amount because climate is influenced by various factors, including temperature, evaporation rates, and prevailing wind patterns. Some regions with relatively low rainfall may still have humid climates due to high evaporation rates, while other areas with higher rainfall may have dry climates if evaporation exceeds precipitation. The distribution of rainfall throughout the year and the overall water balance in an area are crucial in determining whether it falls into a humid or dry climate category.
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