Last night on the Dayzcore server I ran into invisible rain. I was running in the woods north of Chernogorsk when my character started shivering and making the freezing sounds, I brought up the HUD and saw the "wet" icon was active and when I checked my inventory all my clothes were drenched. The sky was clear and sunny, yet the game certainly thought it was raining... When listening closely I could hear the sound effect of light rain, only it was so muted (by the muted ambient sound bug, reported that in a separate issue) that I had not heard it over my running.
I might have video of this saved on my gaming computer, if this can be of help I can upload it later.