Parked on a shaded street, so I’m guessing it’s not the sun? Stumped though.
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From what I have seen, the frost comes from above.
I’ve seen some places where an awning has made a frost shadow, you’d see a clear line following under whatever was on covering it.
These were 8-10 foot from the ground, so it seems like frost forms from cold air and moisture dropping straight down.
Anything at an angle to that will have less, and vertical sides usually have the least.
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