In which weather conditions is IFR flight generally required?

Instrument Flight Rules (IFR) flight is generally required in conditions where visibility is low or where flying by visual references is not possible. This typically includes scenarios like fog, rain, snow, or other low-visibility situations where pilots cannot maintain a clear visual reference to navigate.

In these conditions, pilots must rely on their instruments to control the aircraft and navigate safely. The main purpose of IFR is to ensure that even in hazardous conditions, pilots can operate the aircraft safely by using instruments to monitor altitude, direction, and other critical flight data.

The other weather conditions mentioned—clear skies, high temperatures and humidity, or light rain with good visibility—do not generally necessitate IFR flight, as pilots are able to maintain visual references and navigate safely without instrument assistance. Therefore, when conditions are hazardous and may impair visibility or create a dangerous environment for visual navigation, IFR becomes essential for safety.