Last night, the cold north wind blew great snow clouds over the sky.

昨天夜里，北风寒冷凛冽，大雪遮盖了整个天空。

When things like fog, snow, clouds, or rain get in the way, you can't see as far, so we'd say the visibility goes down.

当雾、雪、云或雨之类的东西挡住去路时，你就看不了太远了，我们称这种情况为能见度降低。