《旧唐书·本纪·卷十七》
自去冬以来，雨雪下了一个多月，寒冷的北风刮个不停，气候很是反常。
自去冬已来，逾月雨雪，寒风尤甚，颇伤于和。
Since last winter, it has been snowing and raining for more than a month, and the cold north wind has been blowing non-stop, which is very abnormal.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 自去冬已来，逾月雨雪，寒风尤甚，颇伤于和。 [/INST] Since last winter, it has been snowing and raining for more than a month, and the cold north wind has been blowing non-stop, which is very abnormal.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 自去冬已来，逾月雨雪，寒风尤甚，颇伤于和。
user
Since last winter, it has been snowing and raining for more than a month, and the cold north wind has been blowing non-stop, which is very abnormal.
assistant