What is representing winter season.

the coming of cold

you start feeling cold

I think snow

slowly the amount of heat decreases and amount of cold increases because the earth move and slowly-slowly get away from the sun

Writers use symbols related to seasons to express ideas such as feelings, the passing of time and age.

The season provides the setting for painful messages, as well as messages of renewal, rebirth and hope ,the lack of sunlight and the darkness of the days.
reflects on the warmth of humankind and nostalgia as compared to the tedium of the winter season.

The freezing up of the atmosphere

The freezing up of atmosphere

Coming of cold

Old age according to keats poetry