Short answer: yes, most of the time. A well-designed drone-in-a-box flies in light rain, moderate wind and sub-zero temperatures. It does not fly in strong gusts, heavy rain or snow, or in freezing fog and freezing rain. In our analysis of ten years of weather data, a drone with typical limits would have been grounded roughly one hour in nine in Prague and one hour in six on the North Sea coast, with nights noticeably better than days.
What limits a drone-in-a-box in bad weather?
A drone in a box has two parts that face the weather differently. The dock sits outside all year and has to survive everything: storms, frost, heat and snow. The drone only has to cope with the weather during a flight, but it has far less margin, because it is light, battery-powered and held up by spinning propellers. In practice, these six factors decide whether a flight can go ahead:
- Wind and gusts. The most common reason to stay on the ground. Landing back on the dock is the critical moment.
- Rain and snow. Limited by the drone's water protection and by what the camera can still see.
- Cold. Reduces battery capacity and stops batteries from charging safely.
- Icing. Freezing fog and freezing rain can disable a multirotor within minutes. This is a hard no-fly condition.
- Visibility. Fog and low cloud do not always stop the drone, but they can make the video useless.
- Heat. Mostly a dock problem: electronics and charging batteries need cooling in summer.
What do IP ratings mean for a drone dock?
Vendors quote IP ratings under IEC 60529. The first digit is protection against dust and solid objects, the second is protection against water. The second digit is not a simple ranking, which is why the numbers are easy to misread.
| Rating | Dust | Water | What it means outdoors |
|---|---|---|---|
| IP54 | Dust-protected | Splashing from any direction | Rain, but not driven rain or hosing |
| IP55 | Dust-protected | Low-pressure water jets (12.5 l/min) | Driving rain; the usual rating for dock drones |
| IP56 | Dust-protected | Powerful water jets (100 l/min) | Storm-driven rain; some dust can still enter |
| IP65 | Dust-tight | Low-pressure water jets (12.5 l/min) | Driving rain, and no dust ingress at all: useful on construction sites, quarries and solar parks |
Commercial docks on the market in 2026 are typically rated IP54 to IP56, and their drones IP55. Check whether a dock's rating applies with the lid open or only closed: a dock is most exposed during launch and landing, when the lid is open.
An IP rating is a laboratory test on a new unit. It says nothing about seals after three winters, condensation inside the enclosure, or snow drifting into a vent. Ask how the dock manages humidity and what the maintenance interval for seals is.
How much wind can a security drone handle?
Docks on the market typically publish a take-off and landing wind limit of around 12 m/s (about 43 km/h, or 6 on the Beaufort scale). Three things make the real-world limit lower:
- Gusts, not averages. A forecast of 7 m/s with gusts to 14 m/s is a no-fly forecast. The drone has to land precisely on a pad, and a gust at the last metre is what causes hard landings.
- Height. Wind speed usually increases with height above the ground. A dock anemometer at 2 m can read calm while the drone at 50 m is fighting a much stronger wind.
- Site effects. Buildings, tank farms and container stacks create turbulence and wind channels. Turbines at a wind farm leave wakes downwind.
Wind also costs range. A drone flying into a headwind uses more energy, and it must keep enough battery to come home against the wind. A good mission planner checks the return leg, not just the outbound one.
Rain and snow
With an IP55 drone, light and moderate rain is usually fine for flying. The limits come from elsewhere: water droplets on the lens, rain streaks that confuse person detection, and reduced range for laser rangefinders and obstacle sensors.
Snow is harder. Falling snow blinds cameras, wet snow can stick to the airframe, and snow on the dock lid or landing pad can stop the dock from opening or the drone from landing. That is why docks heat their lids and their wind sensors. Heating draws a lot of power, so ask what still works when the dock runs on its backup battery: a winter power cut is exactly when a site is most exposed.
What does cold do to drone batteries?
Lithium batteries lose capacity in the cold. Exact figures vary by cell chemistry and by how warm the battery is at take-off, but losing a quarter or more of the flight time around -10 °C is common, and cold batteries also sag in voltage under load. Charging is the bigger problem. Charging a lithium cell below its minimum temperature can plate lithium metal on the anode, which permanently reduces capacity and can cause internal short circuits. Dock batteries typically need to be above about 5 °C to charge, so docks and batteries heat them first in cold weather.
This is one of the trade-offs between the two dock designs:
- Charging docks charge the battery inside the drone. In winter the drone has to warm the battery first, which adds time before it is ready again.
- Battery-swap docks replace the battery with a charged one kept inside the enclosure. Spare batteries can be held at charging temperature, so the drone can launch again in minutes, even after a cold flight.
Docks themselves are usually rated to operate down to somewhere between -20 and -40 °C. In the lowlands of Central Europe, temperatures below -20 °C are rare; in our Prague data they did not occur at all in ten years. Altitude sites and Scandinavia are a different story.
Why icing is a hard no-fly condition
Freezing fog, freezing drizzle and freezing rain contain supercooled water droplets that freeze on contact. On a small propeller, ice changes the blade shape within seconds. In icing wind tunnel tests at NTNU on a 381 mm UAV rotor at -5 and -10 °C, thrust fell within the first minute while the torque needed to turn the rotor kept climbing; in one run the motor current exceeded the speed controller's rating after 80 seconds and the test had to be stopped. Chunks of ice then break off unevenly and shake the rotor. A multirotor has no glide: when its propellers ice up, it falls.
Heated and coated propellers are being researched, but none of today's dock drones are certified to fly in icing conditions. The practical answer is detection: a temperature between roughly 0 and -10 °C combined with fog, drizzle or rain means the drone stays in the box. Ice on the dock is a separate problem: freezing rain can seal a lid shut, which is another reason for lid heating.
Fog, low cloud and darkness
Fog rarely stops a drone from flying, since navigation relies on GNSS rather than sight. It does stop the drone from being useful. A daylight camera sees little in thick fog. A thermal camera does better because it detects heat rather than light, but water droplets still attenuate the signal. Low cloud matters if the patrol altitude is close to the cloud base. Darkness, by contrast, is not a weather limit at all for a security drone with a thermal camera; most security flights happen at night.
How many hours a year can a drone-in-a-box fly?
Datasheets give limits; they do not tell you how often those limits are crossed at your site. To get a feel for it, we took ten years (2016–2025) of hourly ERA5 reanalysis data for three locations and counted the hours in which a drone would have been grounded under two sets of limits:
- Typical limits: gusts above 12 m/s, rain at 1 mm/h or more, any snowfall, freezing precipitation, or below -20 °C.
- Cautious limits: gusts above 10 m/s, rain at 0.5 mm/h or more, and the same snow, icing and cold rules.
| Site | Grounded, typical limits | at night (20:00–06:00) | Grounded, cautious limits | Longest grounded spell |
|---|---|---|---|---|
| Prague (inland, CZ) | 10.9% | 7.7% | 20.1% | 73 h |
| Ostrava (inland, CZ) | 12.9% | 10.3% | 24.1% | 61 h |
| Bremerhaven (North Sea port, DE) | 17.7% | 13.1% | 31.2% | 90 h |
Wind was the main cause everywhere: in Prague, gusts accounted for 7.5% of all hours under the typical limits, snow for 2.1% and rain for 1.9%. The seasons differ sharply. In Prague the grounded share under typical limits was:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 22% | 20% | 12% | 10% | 8% | 8% | 6% | 5% | 6% | 9% | 8% | 16% |
Three conclusions for security planning:
- Nights are calmer. Surface winds usually drop after sunset, so the hours that matter most for security are also the most flyable.
- Winter is the weak season. In December to February, plan for roughly one hour in five without the drone at an inland site, and more on the coast.
- Bad spells come in blocks. Storms can ground a drone for two or three days in a row. Your security design must work without the drone for that long.
How to read these numbers. ERA5 is a reanalysis on a grid of roughly 30 km, not a measurement at your fence. It gives gusts at 10 m, while patrols fly higher, and it does not resolve freezing fog, so icing is undercounted. Treat the figures as an order of magnitude and a way to compare sites, not as a guarantee. For a real site, use data from the nearest station of the national weather service and, ideally, a season of measurements from the dock's own sensors.
What happens to security when the drone is grounded?
A drone in a box is one layer of a security system, not the whole system. When the weather closes in, fixed cameras, perimeter sensors and guards carry on as they would without it. What matters is that everyone knows the drone is not coming:
- The system should check the weather before every launch and refuse flights outside its limits, rather than leave the decision to a tired operator at 3 a.m.
- The operator and the alarm receiving centre should see at a glance that the drone is grounded and why, so an alarm is routed straight to a guard or a camera.
- Every grounding should be logged with its reason, so you can report real availability and adjust limits over time.
- For EU specific-category operations, your weather limits belong in the operations manual that supports your authorisation. See our guide to EU drone rules.
Weather questions to ask a drone-in-a-box vendor
- What are the wind limits for take-off, landing and flight, and are they for average wind or gusts?
- What are the IP ratings of the dock with the lid open and closed, and of the drone?
- What is the rain limit, and is there a separate snow limit?
- How does the system detect icing conditions, and does it block flights automatically?
- What is the charging temperature range of the battery, and how is it kept warm?
- What keeps working on backup power: heating, charging, launch?
- What availability have existing customers achieved in a climate like yours, and can they show the logs?
- How are groundings reported to operators and the alarm receiving centre?
Where Nestua stands
We are designing for Central European winters from the start. The Nestua base station is IP65-rated, so it is dust-tight for construction sites and solar parks, and it uses robotic battery swap, so batteries charge inside the station instead of in a cold drone. The drone and the base station are still being built, so we do not publish flight limits yet. When we do, they will come from our own tests through a Czech winter, not from a laboratory, and we will publish them on this blog. If you run a site with difficult weather and want to help us test, talk to us.
Sources
- IEC 60529, Degrees of protection provided by enclosures (IP Code): webstore.iec.ch/en/publication/2452
- Müller, N. C. and Hann, R., UAV Icing: Experimental Analysis of Icing on a Rotor of a UAV, IWAIS 2024 (NTNU): richahan.folk.ntnu.no/Publications/2024_Müller_IWAIS.pdf
- NATO STO SCI-328, Hazards of In-flight Icing on Unmanned Aircraft: richahan.folk.ntnu.no/Publications
- Hersbach, H. et al., ERA5 hourly reanalysis (Copernicus Climate Change Service), accessed through the Open-Meteo Historical Weather API: open-meteo.com/en/docs/historical-weather-api