Which precipitation types most commonly produce IFR weather?

The choice of rain, drizzle, and snow is aligned with common precipitation types that frequently lead to Instrument Flight Rules (IFR) weather conditions. These forms of precipitation can reduce visibility significantly, which is a primary factor contributing to IFR conditions.

For instance, rain can create low visibility due to heavy downpours, while drizzle tends to produce a constant, low visibility environment. Snow also contributes to IFR, particularly when it falls heavily or causes accumulation that can impact both visibility and runway conditions.

In contrast, while other types of precipitation like snow, sleet, and hail may also influence weather conditions, they are not as prevalent or consistent in creating IFR scenarios as rain, drizzle, and snow. Fog and mist can also lead to IFR but are more atmospheric phenomena rather than precipitation. Thunderstorms can create severe conditions, but they encompass a broader impact beyond just visibility reduction and are typically classified in their own right.

Overall, the combination of rain, drizzle, and snow makes this choice the most representative of conditions that commonly result in IFR weather.