Attic view roofing nails

Looking at a roof in Washington state. Temp is 43 degrees, roofing material is 10+ yrs old. Attic view of roofing nails as indicated by photo shows a drop of moisture on the tip of most nails, I’ve never seen this before, is this normal, ventilation appears fine.

I have seen the drip of water on most roofing nails. I attribute it to the nail is the coldest thing in the attic, so that’s going to be where any moisture is.

To determine if that’s the cause, you’d want the humidity level inside, the nail temperature, attic temperature.

That’s what I was thinking but wanted some backing, thank you.

An added clue, it might be different on the sunny and shaded side of a roof, at different times of day.

Thanks again Bryce