A few days ago we had very light rain with mist coming in from the NE quarter - this was being driven with a wind of average speed of about 15km/hr. While we could see the rain, it was not being register by Sky. It appeared not to be working, but later as the rain became heavier and from the South the recording was working. It almost appeared that the wind was preventing measurement, maybe due to boundary conditions preventing the rain touching the sensor, and being carried over it.
To understand the rain “density” in Hamburg it would be called spu regen - in a word not much, can be seen and is rather wetting.
I would be interested in any comments.