Core Viewpoint - The article discusses the ongoing high-temperature and humid weather across most regions of China, highlighting the release of the first national humidity index map by the China Meteorological Administration, indicating a "sauna mode" experienced in various provinces [1] Summary by Relevant Sections - **Weather Conditions** - From August 15 to 17, most areas in central and eastern China are experiencing humid and hot weather, with over ten provinces including Hainan, Guangdong, and Hebei in "sauna mode" [1] - Regions such as central and southern Fujian, southern Zhejiang, eastern Guizhou, and southern Heilongjiang feel slightly humid, with dew point temperatures mostly between 20 to 24°C, leading to a sticky feeling [1] - In contrast, areas like Xinjiang, Qinghai, and most of Inner Mongolia have dew point temperatures below 20°C, resulting in dry weather without the humid sensation [1] - **Dew Point Temperature Explanation** - The dew point temperature refers to the temperature at which water vapor in the air condenses into dew. Meteorological experts explain that the atmosphere's capacity to hold water vapor is limited, and higher temperatures can hold more moisture [1] - When the temperature drops to a certain level while the moisture content remains constant, the air reaches saturation, and water vapor condenses into droplets, indicating the dew point temperature [1] - An example provided is that when taking a cold drink out of the refrigerator, the bottle's surface quickly "sweats," reflecting the current air's dew point temperature [1] - Higher dew point temperatures, closer to air temperature, indicate more humid and muggy conditions [1]