As density altitude increases, how does aircraft performance change for sUAS?

Why →High density altitude means lower air density. Every performance aspect degrades: propellers move fewer air molecules per rotation (less thrust), rotors generate less lift per unit speed, and higher rotor RPM needed to maintain hover draws more current and reduces battery endurance. Performance degradation is significant well below 10,000 feet.

The trap →While thinner air reduces parasite drag (slightly beneficial), the thrust and lift losses far outweigh any drag reduction. Performance degradation at altitude and high temperature is substantial, not negligible.

Field note →A drone rated for 25 minutes at sea level at 70°F might achieve only 18–20 minutes at a 6,000-foot MSL site on a hot day. Density altitude = pressure altitude corrected for temperature. Calculate it before high-elevation commercial operations.