What is the word for cold and hot weather? What is the symbol?

[zhànuán Huán Han]

[Interpretation] Describe the weather in late winter and early spring, which is hot and cold.

[Source] Song Liqing according to the word "Sound Slow": "Looking for it is cold and clear, and it is sad. It is the most difficult to rest when it is warm and cold. " Liu Song Qing Fu's poem "Jade House Spring" reads: "The willow branches are green and the eyebrows are like seals. It is still uncertain whether it is warm or cold. "