1.   But the catch is that heat pumps work best when it is not real cold outside.

2.   It was cold outside and the smell of stale tobacco clung to their winter coats.

3.   It was cold outside, and she was glad of her coat.

4.   It was raining and freezing cold outside.

5.   It was very cold outside, and both had only night clothes on.

6.   It was very cold outside, but our tents were snug and warm.

7.   It was winter, bitterly cold outside.

8.   Billy!

9.   Although it was raining and freezing cold outside, we all got ready and pulled ourselves into our wet suits and set off for the river.

10.   And it was cold outside.