Why is it not too cold when it snows, and the weather will plummet after snow?

In winter, when it snows, people feel cold, and when it melts, they feel much more cynical. Why? In winter, cold air moves from north to south, and when it meets warm and humid air from the south, it will be overcast and produce snowfall. Before it snows, the cold air is weak (so the wind is very weak), and it will gradually pick up after staying in the local area for a long time. The airflow from the south will bring warmer air to the north. When the influence of cold air is strengthened, warm and humid air is lifted into clouds, and the sky is covered with clouds. Like a quilt, the heat on the ground is not easily lost. Therefore, people will not feel too cold before and during the snowfall in winter. When the cold air force continues to strengthen during the snowfall, so that strong cold air can control the local area, the snow will stop and the weather will clear up. At this time, due to the control of cold air from the ground to the hollow, the north wind or northwest wind blows more, the wind is stronger, the clouds dissipate and lose their heat preservation function, and the snow surface reflects more. In addition, when snow melts under sunlight, it will absorb a lot of heat from the near-surface air layer to reduce the temperature. So people will feel much colder when it melts than when it snows.