外面一片漆黑。

It's all dark outside.

It's totally dark outside.

It's pitch black outside.

Source: Tatoeba

Sentence Composition

1 外面 wàimiàn
  1. outside (also pr. wàimian for this sense)
  2. surface
  3. exterior
  4. external appearance
2 一片 yīpiàn
  1. (one) piece, slice; one film
  2. piece, slice; one film
3 漆黑 qīhēi pitch-black