A mild night
The ground stays dry
Cloud or a breeze keeps the ground from giving its heat away. If the air stays well above the dew point, nothing condenses on the grass.
Frost and dew
Frost
For the mornings worth getting up for.
What frost is
A frost night
Cold settles on the ground
On a clear, still night the ground radiates heat away and chills the air resting on it. Moisture condenses — dew if it stays above freezing, frost if it drops below. Spider webs, grass, fence posts, car roofs.
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Frost is for information, not a safety forecast.