How it works

The Flight Safety Algorithm

How Weather4Fly translates raw weather data into a clear go / no-go rating.

Weather4Fly looks at the conditions that matter most for an outdoor drone flight — wind, temperature, precipitation and visibility — and scores each one against sensible thresholds. Those individual scores are then combined into a single, easy-to-read result so you can make a quick decision before takeoff.

The app surfaces a simple Safe / Caution / No Fly status, backed by a more granular four-tier rating.

The four-tier rating

Excellent

Safe

Conditions sit well within comfortable limits across every measured factor.

Good

Safe

Conditions are workable, with a small margin used on at least one factor.

Marginal

Caution

At least one factor is approaching a limit. Extra care and judgment are warranted.

Poor

No Fly

At least one factor exceeds a safe threshold for the flight.

The most restrictive parameter wins

The overall rating is never an average. Weather4Fly takes the worst single factor and lets it govern the result. If wind is excellent but visibility is poor, the flight is rated Poor. This conservative approach keeps a single dangerous condition from being hidden behind otherwise good numbers.

Wind

Wind is evaluated relative to your drone's maximum wind capacity, not against a fixed number. The same gust can be fine for one aircraft and unsafe for another, so the tiers scale with each drone's rated limit.

Wind rating tiers
Range	Rating	Notes
Up to ~60% of max	Excellent	Comfortable margin below the drone's limit.
~60% – 80% of max	Good	Within limits, with some margin used.
~80% – 100% of max	Marginal	Close to the drone's rated capacity.
Above 100% of max	Poor	Beyond the drone's rated wind capacity.

Temperature

Both extremes reduce performance. Very cold air shortens battery life and flight time, while high heat adds stress to batteries and electronics.

Temperature rating tiers
Range	Rating	Notes
Around 5°C and below	Cold — reduced performance	Battery and flight time can suffer in the cold.
~15°C – 25°C	Optimal	The comfortable operating range for most drones.
Around 35°C and above	Hot — added stress	Heat can affect batteries and electronics.

Precipitation

Most consumer drones are not built to fly in the rain, so the app distinguishes between essentially dry conditions and active precipitation.

Precipitation rating tiers
Range	Rating	Notes
None to ~0.1 mm	Light / dry	Effectively dry conditions.
Above ~0.1 mm	Active precipitation	Rain or other precipitation is falling.

Visibility

Clear visibility supports keeping the aircraft in sight. The rating steps down as visibility drops.

Visibility rating tiers
Range	Rating
More than 10 km	Excellent
More than 5 km	Good
More than 1 km	Marginal
1 km or less	Poor

Disclaimer: Weather4Fly is intended for weather awareness and pre-flight planning. It does not replace official aviation authority data, local drone regulations, pilot judgment, or required flight authorization.