What is the common climate factor influencing sake production in Hyogo?

The correct answer is high humidity. In Hyogo, a region renowned for sake production, the climate features high humidity, which plays a crucial role in the cultivation of sake. The elevated humidity levels during the brewing season help maintain a consistent environment that is beneficial for the fermentation process. Additionally, high humidity can assist in the preservation and growth of the koji mold, which is essential for converting starches in rice into sugars during sake production.

This climatic condition also supports the overall extraction of flavors and aromas, enhancing the quality of the final sake product. The interaction of humidity with the local temperature and seasonal variations helps create ideal conditions for the brewing process, ultimately contributing to the unique characteristics of Hyogo sake.