What is a condition that doesn't require human presence to be observed?

You’re asking for a condition whose occurrence or state does not require a human to be present to be observed. In other words: a property, event, or phenomenon that can be detected, measured, or verified without a person being physically there.

Short answer

• A condition is "observer-independent" (or objective) when it can be recorded or detected by instruments or by effects that persist and can be examined later, so no human must be present at the moment it happens.

Examples (with brief explanation)

• Temperature of an environment: a thermometer (or data logger) records temperature over time; the reading exists even if no one watches it in real time.
• Atmospheric pressure, humidity, or wind speed: weather stations automatically measure and log these quantities.
• Radioactive decay: detectors and counters record decay events; decay happens independent of observers.
• Seismic events (earthquakes): seismographs register ground motion whether or not anyone is there to witness it.
• Photographic exposure: a camera can capture light on film or a digital sensor; the recorded image can be examined later.
• Machine logs / computer telemetry: servers and sensors write logs that show past states or events (errors, transactions) without a human watching.
• Chemical residues or reaction products: a laboratory assay can later reveal that a reaction occurred or a substance was present.
• Footprints, tracks, or physical traces: they persist and can be inspected later to infer what happened.
• Biological indicators: tree rings record past climate conditions; ice cores trap atmospheric gases and particulates for later analysis.
• Astronomical events: light from a supernova can be detected by telescopes without humans being at the telescope when the light arrives (and some telescopes automatically record data).

Why this matters

• Distinguishing observer-independent conditions from observer-dependent ones (like someone’s reported feeling or a subjective judgment) is important in science, law, engineering and monitoring: objective conditions allow reliable measurement, automated detection, and reproducible verification.

If you had a specific context (physics, law, monitoring, philosophy), tell me and I can tailor examples and the precise terminology.