🌤️Meteorology

Weather and drones: Understanding limiting flight conditions

Feb 22, 2026
10 min read

35km/h

Max Wind

Average limit for stable GPS stabilization.

1.5km

Visibility

Minimum visibility for visual line of sight (VLOS).

95%

Humidity

Major risk of internal electronic malfunction.

CertifDrone technical visualization
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Layer Type

Vector schematic

Certification

EASA 2026 Ready


Flying safely: Anticipate to not suffer


Weather is often the number one factor in drone accidents. For a professional remote pilot preparing for their CATS, knowing how to read the sky is as important as knowing how to fly.


Wind: Gusts and Gradient

Don't confuse average wind and gusts. A C1 certified drone can often fly up to 35 km/h, but a 50 km/h gust can destabilize its sensors and cause a "fly-away".

  • **Wind gradient:** The higher you go (up to 120m), the stronger the wind. Always anticipate your return facing the wind!

    • Visibility and Clouds

    In Open and Specific CATS-01 categories, flight must be within line of sight (VLOS).

  • **Fog:** As soon as horizontal visibility falls below 1.5 km (or more depending on orders), flight is prohibited.
  • **Cumulonimbus:** If you see these "anvils" in the sky, land your aircraft immediately. Updrafts and turbulence are fatal for multirotors.

    • Understanding METAR/TAF

    Indispensable for CATS, METAR messages give you the current state of an airfield.

  • EX: `LFPN 14005KT 9999 FEW030 18/06 Q1013`
  • Translation: Toussus-le-Noble, wind from 140° at 5 knots, visibility greater than 10km, a few clouds at 3000 feet.

    • **Regulatory Reminder:** Drones fear humidity. Even without heavy rain, dense fog can saturate electronic circuits and freeze blades at high altitude in winter.

    Atmospheric Pressure and Lift

    Relationship between altitude (hPa) and rotor efficiency.

    Frequently Asked Questions

    F.A.Q

    Unless your drone is IP certified (like the DJI Matrice 300), flying in the rain is strongly discouraged.

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