What is the melting point of beer? 

The melting point of beer, just like the boiling point, depends on the volume of the alcohol present in the beer. Alcohol boils at around 78°C, that is, at a lower temperature than pure water. The cause is that the forces that bond the water molecules together are greater than the forces that hold the alcohol molecules together. A mixture of water and alcohol will boil at a temperature of somewhat less than 100 °C. 

For the same reason beer freezes (or melts) at a rather lower temperature. Alcohol requires less energy supply to go over to a solid or fluid form than water than ice requires to become water. A mixture of water and alcohol will consequently thaw at a temperature below 0°C. How much lower depends on the sort of beer, the degree of alcohol and the other ingredients present in the beer. 

Beer & Health