-15 degrees Celsius is a temperature that is well below freezing. At this temperature, water turns to ice, and snow can accumulate on the ground. It is common in winter months in many regions, especially in places like Canada and Scandinavia. At -15 degrees, outdoor activities can become challenging due to the cold. Proper clothing, such as insulated jackets and thermal gloves, is essential to prevent frostbite and hypothermia. This temperature can also affect vehicles and machinery, making it important to take precautions to ensure they operate effectively in such conditions.