How to judge whether a poem is seasonal?

The so-called seasonal poems are poems related to seasons. Then the seasons here mainly refer to the traditional 24 solar terms in China, namely: vernal equinox, rain, fright, beginning of spring, Qingming, Grain Rain, Long Summer, Xiaoman, Mang, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, and Xiaoshu. In other words, the poems about these 24 solar terms are generally seasonal poems.

For example, Du Mu's poem Qingming:

Qingming Festival

Du Mu

It rained a lot during my stay in Tomb-Sweeping Day.

Pedestrians on the road want to die.

Ask local people where to buy wine?

The shepherd boy just laughed and didn't answer Xingshan Village.