《旧唐书·本纪·卷十六》
九月初十，先连下了三日大雨，到这天下起雪来，没有刮风而树木的十之五六都倒在地上。
己酉，大酺三日，至是雨雪，树木无风而摧仆者十五六。
On the tenth of the ninth month, there had been three days of heavy rain. However, when snow did fall that day, there was no wind, but ten out of five or six trees fell to the ground.