What idioms and poems about winter remind you of the sentence "There are many days in Leng Xue, and all subjects are difficult"?

Summer has come and the cold has gone; The mountains are cold and the water is cool; Autumn harvest and winter storage; Snow omen and abundant years; Summer insects face bacteria; Wen Ding Province; The sky is closed; Ge Wei's cream; Warm in winter and cool in summer; Set fireflies to reflect snow; Yan Yan flies on behalf of others; A stove in summer and a fan in winter; No winter and no summer; Yellow cotton-padded coat; Holding ice in winter; Warm in winter and cool in summer; Winter temperature and summer weather; Black fur in winter; Xia Yun in winter; Lovely in winter; The temperature in winter; The sun in winter; Winter and summer; Winter mountains are like sleep; Winter moon has no clothes; Spring grows in summer and autumn harvests in winter; Residual winter and twelfth lunar month; Fat winter and thin year; tenth