Until now, during every clear night the air had been frosty.
When she came in her cheeks were glowing from her run in the frosty air.
Rosie had lifted her frosty face in a smile of welcome, but Amelia did not see it.
And even as they eased him down upon the blankets his snores were rising on the frosty air.
"That would be unfortunate," he said, with his frosty smile.