Welcome to the least formal month in the calendar of the fictional y Ddraig world.
The Time of Frost began on the quarter moon (half light/half dark) and marked the turning of the weather for, now, people and animals began to emerge from the shelters that hopefully got them through winter in one piece. This was a time of experienced assessment, for releasing the animals to the woods if the worst of winter had not truly passed could mean their deaths and, thus, your own. But if the worst had indeed passed then rugged up people and thick coated animals could return into the frost-covered world in readiness for the melting season to come.
Frost is a time of emergence, seeing what had survived and little else.