It is a cold winter day in Boston with a temperature of -7° C (19° F) and forecast of 3 cm of snow. How do the weather conditions determine the possibility of snow? It is a cold winter day, and it snows every day in the winter. It is winter, and the temperature is well above freezing, causing snow. It is winter, and the temperature is well below freezing, making snow likely. Snow is expected to fall at temperatures at or above freezing.​