-9 degrees Celsius is a temperature that is below the freezing point of water, which is 0 degrees Celsius. At this temperature, water turns into ice, and snow can form in the atmosphere. It is commonly experienced in winter months in many regions, especially in places with cold climates. At -9 degrees, outdoor activities may become challenging due to the cold. People often need to wear warm clothing, such as jackets, hats, and gloves, to protect themselves from the harsh conditions. This temperature can also affect vehicles, as batteries may struggle to start, and roads can become icy, making driving hazardous.