Weather/physics question

Weather/physics question

To all you smart people on this list I have a question: I live in northern Virginia, outside of Washington, DC. Last night the temps in my neighborhood dipped to 38 degrees F (I have an outdoor digital thermometer, that is very acturate). I noticed that some roofs and lawns had actual frost on them this morning. How can there be frost if the temp was 6 degrees F, above the freezing point? Respectfully, Flummoxed in Falls Church
Because I’ll be busy on Sunday– Mother’s Day blooms on Saturday.

Because I’ll be busy on Sunday– Mother’s Day blooms on Saturday.

Sweet Southern Comfort :)

Sweet Southern Comfort :)

My Room =)

My Room =)

Mushrooms–friend or foe?

Mushrooms–friend or foe?

Blue flower ID

Blue flower ID

Spring is here

Spring is here