When the weather is the lowest, the asphalt on the ground will melt.

Asphalt is a multi-component mixture, not a crystal. There is no fixed melting-deformation curve and no fixed melting temperature (this is the key to distinguish crystal from amorphous). Asphalt has only one softening temperature range. It has high temperature sensitivity. The asphalt used in engineering is mostly petroleum asphalt, which is a mixture of complex hydrocarbons and their nonmetallic derivatives. Usually the flash point of asphalt is between 240℃ and 330℃.