What's wrong with snowing in summer?

Dou E's Injustice, also known as Six Heroes in the Snow, comes from Guan Hanqing's zaju Dou E's Injustice.

Both Yuan and Du tried and adopted her seven-year-old daughter as a child bride. Dou E died when she was seventeen. Cai Po was killed for debt collection and was saved by Zhang Maolv's mother and son (one of whom was a father and son). Zhang Maolv tried to make Cai Po occupy Dou E, but made his mother drink poison by mistake. Zhang took the opportunity to blackmail, but was rejected, so he took the matter to court. In vain, Zhao was beheaded. I made three wishes before I left, and the world felt them. It snowed in June, and Chuzhou was dry for three years. In order to avenge this, his father Dou paid a courtesy visit to the two Huai envoys.

Therefore, future generations often use six In the snow, which is more unfair than Dou E's.