Normal conditions cause water to freeze at 0 degrees Celsius. According to About.com, the freezing point is the temperature at which a liquid becomes a solid. The Celsius scale is the official temperature scale for the majority of the globe, but the Fahrenheit scale is still in use in the United States.
Water boils at a temperature of 100 degrees Celsius. These freezing and boiling values are based on pure water and one atmosphere of pressure. More or less pressure, or the presence of contaminants in the water, somewhat alters the freezing and boiling points. Zero degrees Celsius corresponds to 32 degrees Fahrenheit and 273.15 degrees Kelvin on the temperature scale.