It is often ————（snow）in the north of China in winter中填snowing 还是 snowy

snowy ,因为有often,经常下雪,不是正在下雪.
It's snowing .不能加ofen.如果说没有often 是不是两者都可以用？差不多是的，但最好说 It's snowing in the north of China today.时间修饰。