What defines instrument meteorological conditions (IMC)?

Instrument meteorological conditions (IMC) are defined by weather conditions that are below the Visual Flight Rules (VFR) minimums. VFR minimums refer to the set of visibility and cloud cover standards which determine when a pilot can operate an aircraft under visual flight rules, relying on their ability to see and navigate visually. When the weather conditions fall below these minimums, pilots are required to rely on instruments for navigation and control, thus categorizing the situation as IMC.

The understanding of IMC is crucial for pilots, as it influences their planning and operational decisions. Flights conducted in IMC require the use of instruments and adherence to specific regulations and procedures designed to ensure safety in less-than-ideal weather conditions. Recognizing and adhering to the distinctions between VFR and IMC helps maintain safety in aviation operations.

The other options involve conditions that do not accurately reflect the nature of IMC; they either describe situations that are safe for visual flight or are not specifically associated with instrument conditions.