Freeze Warning?

Can someone explain why we’re getting a freeze warning when it’s 50 outside 🥹 For context I get text and push notifications from the Everbridge app

**EDIT yes, I know it gets colder at night. The low tonight doesn’t drop below 39 according to the app I use. That’s why I’m asking. I’m from the northeast and not used to freeze warnings at these temps. Happy thanksgiving you silly grumps.