The ancient Egyptians knew about snow. It snows rarely in Egypt, and also occasionally hails, but it snows more often in nearby mountainous areas such as Lebanon. Lebanon was at times part of the Egyptian empire, and in any case Egyptians would have encountered snow, or at least heard of it, when trading with the Hittite empire in what is now Turkey.

The Egyptian word for snow, "talgu", is of Semitic origin. It is rarely attested, appearing in collections of meteorological terms and in the following passage (13th century BCE):

Those that I sent would have to go on the mission to Djahi [roughly, northern Palestine and southern Lebanon] in the days of rain and snow that occur in winter. Then he [the king] offered a great sacrifice to his father Sutekh. He approached his face, saying: "Heaven is in your arms. Earth is beneath your feet. All things are ordained for you, such as preventing rains, cold winds, and snows."

-- Hoch, "Semitic Words in Egyptian Texts of the New Kingdom and Third Intermediate Period", P 265.

From this passage, it seems that snow was considered dangerous, harmful or at least unpleasant.