The temperature at which water freezes in Celsius is 0 degrees Celsius. This freezing point marks the transition from liquid water to solid ice under standard atmospheric pressure. In the context of chemistry and physics, this temperature is critical as it represents a fundamental property of water, influencing weather patterns, climate systems, and life on Earth. The freezing point of water can vary under different pressures, but the standard measurement used globally is 0°C. This characteristic is essential for various processes, including cooking, environmental science, and understanding the properties of different materials.