The freezing point of water is 32 degrees Fahrenheit under standard atmospheric pressure. At that temperature, liquid water and solid ice can exist in equilibrium.
The Fahrenheit scale places water’s freezing point at 32°F and its boiling point at 212°F at standard atmospheric pressure. Those points are 180 degrees apart, which is why a Fahrenheit degree is smaller than a Celsius degree. Water freezes at 0°C, the Celsius value corresponding to 32°F.
The exact freezing behavior of water can vary with conditions. Dissolved substances such as salt lower the freezing point, which is why salt helps melt ice on roads. Pressure and impurities can also affect the precise transition temperature. In ordinary household and classroom contexts, however, 32°F is the accepted answer.
A frequent mix-up is confusing freezing and boiling points. Water boils at 212°F, not 32°F, when pressure is standard. The Fahrenheit scale’s 0°F is also not water’s freezing point; it was historically linked to a particular brine mixture rather than pure water.