Antonyms for the word "most sub-zero" include the following: warmest, hottest, mild, temperate, balmy, and tropical. When we say 'most sub-zero,' we mean an extremely cold temperature. However, its antonyms imply the opposite, a warm temperature or a comfortable climate. While sub-zero temperatures may occur in some areas during winter, tropical regions experience warm weather throughout the year. In some cases, a mild temperature can be the most desirable, especially when it is neither too hot nor too cold. Therefore, knowing antonyms for 'most sub-zero' is essential in understanding the different kinds of temperature and weather patterns that exist around the world.