What is the melting point of pure ice at normal pressure?

For practical purposes of this kind, there is not much of a difference; in this case, we are looking at the temperature as a function of the pressure, which is the same in both reference systems (1 atmosphere); most physical reference points are given at STP (Standard Temperature and Pressure), not NTP (Normal Temperature and Pressure).

The effects of extremely high pressures on the melting point of water are discussed in this fascinating paper: https://tutor.hix.ai

Matter's temperature remains constant when it changes states: from solid to liquid (melting), from liquid to solid (freezing), from liquid to vapor (boiling), or from vapor to liquid (condensation).

This is the "phase transition temperature," which varies depending on the compound or element and won't change until the entire compound has undergone a phase transition.

The melting point of pure ice at normal pressure is 0 degrees Celsius or 32 degrees Fahrenheit.