It's important to understand the limitations of your equipment.
Your drone's height measurements are all done with a barometric sensor that measures air pressure and all heights are based on the power up location = 0 metres.
Setting heights...
That wouldn't be effective with the drone moving forward though the rain, snow, or fog. Given the turbulence beneath the rotors not be effective even when hovering. Another concern is intruding into the field of view of the camera, unless it was...
Here's what the FAA says.
"As a result, ice accumulation is often greatest at temperatures not too far below 0 °C (32 °F), where LWCcan be abundant. LWC is usually negligible at temperatures below about -20 °C (-4 °F)."
Details on page 9...