What the wind rating on the spec sheet means
DJI lists a "Max Wind Speed Resistance" for each model. For the DJI Mini 4 Pro it is 10.7 m/s. For the larger DJI Air 3 it is 12 m/s. The Mini 4 Pro manual does not treat that number as a comfortable working range. Its list of flight environment requirements says not to fly in wind faster than 10.7 m/s. Transport Canada's guidance for drone pilots puts it more generally: never fly if the weather at the site is outside the manufacturer's operating limits, or if you judge that local weather could affect the flight, even when the forecast says otherwise.
To picture these numbers, convert them to the Beaufort scale. On the Met Office's table, force 5 ("fresh breeze") covers 17-21 knots and force 6 ("strong breeze") 22-27 knots. Using the Met Office's conversion (1 knot = 0.514 m/s), 10.7 m/s is about 21 knots, so the Mini 4 Pro's limit is the top of force 5. The Air 3's 12 m/s is about 23 knots, in force 6.
Two things in the Mini 4 Pro manual shrink that margin further:
- Cold. The manual says the reduced battery capacity at low temperature also reduces the drone's wind resistance (see the cold-weather article on this site).
- Speed. The Mini 4 Pro's maximum horizontal speed is 12 m/s in Normal and Cine mode and 16 m/s in Sport mode, both measured at sea level with no wind. The Normal-mode figure is barely above the 10.7 m/s wind rating, so near the limit you cannot count on making quick progress against the wind in Normal mode.
The forecast is for 10 metres, and the drone flies higher
The surface wind in forecasts and station reports is a 10 m value. The WMO's guide to meteorological instruments sets a standard height of 10 m above open terrain for wind instruments, because wind speed increases considerably with height, particularly over rough terrain. So the number on your weather app is not the wind at your face and not the wind at 100 m either.
How much stronger does it get? A common rough estimate is the wind profile power law. In neutral conditions over open land the exponent is about 1/7. With that exponent, wind at 120 m (the open-category height limit in the EU) comes out about 40% stronger than at 10 m: a forecast of 7 m/s becomes about 10 m/s at the top, which is close to a Mini 4 Pro's limit. Treat this as an order of magnitude, not a prediction. The same source warns that the simple formula can give quite wrong results where trees or buildings break up the wind near the ground, and that the exponent changes with the stability of the air.
Shelter at takeoff also misleads you. Flyy, a Canadian drone training school, makes the point directly: if you are already at the wind limit while sheltered by trees, you may exceed it once you climb above them. Buildings, trees and terrain also create gusts and turbulence, so keep extra distance from them on windy days. The WMO guide shows how strong this effect is on a wind instrument: closer than 20 obstacle heights to an obstacle, the reading can be off by up to 25%, and at about 10 obstacle heights it can even show the opposite direction.
Before takeoff
- Check the forecast for both the average wind and the gusts. Flyy also reminds pilots that the wind at a particular spot can differ from the regional forecast.
- Look at flags, trees and anything else that shows the wind at the site. If the trees around you are moving, the air above them is moving more.
- Compare what you see with your drone's rating, and leave room for the stronger wind at height and for gusts.
- In the cold, count on less margin than the spec sheet suggests.
In the air: read the drone, not just the app
The first climb tells you a lot. Climb in stages and hover for a moment at each height. On the Mini 4 Pro, the attitude indicator in DJI Fly shows the drone's tilt. When the drone hovers in place, the deep cyan area sits level in the middle. If it does not, the manual says the wind is changing the drone's attitude, and you should fly with caution. A drone that leans hard just to stay in one place has little left for flying back against that wind.
Flyy recommends flying slowly and smoothly in wind, with no sudden stick movements, and giving the drone more time to respond. Watch the battery more closely than usual: the drone spends more power fighting the wind, so land well before the battery is critically low.
Plan the way back before you go out
Wind does not cancel out on an out-and-back flight. Flyy explains why: the distance is the same both ways, but the leg into the headwind takes longer than the leg with the tailwind. So if you can, fly out into the wind and come back with it behind you. If the wind gets stronger during the flight, getting home is then the easier half.
Return-to-home will not solve this for you. The Mini 4 Pro manual says plainly that the drone may not be able to return to the home point when the wind is too strong. A few other details from the same manual matter in wind:
- The default RTH altitude is 100 m. With the RTH setting on Preset, a drone more than 50 m away and lower than the RTH altitude climbs to that altitude before it heads home. On Optimal, it chooses its own altitude when the vision systems can work and falls back to Preset when they cannot. If you have been flying low to stay out of the wind, RTH can take the drone up into stronger wind on the way home.
- When the current altitude and the RTH altitude are far apart, the manual says the battery needed for RTH cannot be calculated accurately because wind speed differs at different heights. It tells you to pay extra attention to the battery prompts and warnings in DJI Fly.
- During Advanced RTH the drone adjusts its speed to wind and obstacles on its own. You can push the pitch stick to make it fly faster, but the manual warns that this drains the battery faster.
When GPS drops out: ATTI mode
The Mini 4 Pro switches to ATTI (attitude) mode when the vision systems are unavailable and the GNSS signal is weak or the compass has interference. In ATTI mode the drone cannot hover or brake on its own, and the manual says wind can make it drift sideways, which is a particular hazard in confined spaces. The manual's instruction is to land as soon as possible. In wind, that drift is the reason to always fly with enough open space downwind of you.