(as) cold as charity

1. Extremely cold. It's as cold as charity in here because the heater's broken. Ugh, the winters here are cold as charity—that's why I'm moving to Florida. Where is your coat? It's as cold as charity out here!

2. By extension, aloof or unfeeling in temperament. Tina's as cold as charity—she'll never help us with this problem. Is Heather mad at me? She was as cold as charity when I tried to talk to her earlier. He looked at me with eyes as cold as charity, and I realized that he had no intention of helping me.

as cold as charity

very cold.