It has been freezing over night for at least a week (meaning frost on the ground every morning). (halfbakedharvest.com)
The project team knew the energy strategy was working when they arrived at the job site one winter's morning to find heavy frost on the ground and an outdoor temperature of 26 degrees. (living-future.org)
We wake up in the dark, there's frost on the ground, and slowly my appetite has been shifting. (simplyquinoa.com)