What distinguishes rain (RA) from drizzle (DZ)?

Rain is characterized by larger water droplets that typically measure more than 0.5 millimeters in diameter, while drizzle consists of smaller droplets, generally less than 0.5 millimeters. This distinction in droplet size is critical for differentiating between the two types of precipitation. Rain tends to have a more significant impact on weather conditions due to its volume and intensity, whereas drizzle is lighter and produces less accumulation over time.

The option regarding altitude does not accurately capture the primary differences between rain and drizzle, as both can occur at varying altitudes based on the weather patterns. The comparison of duration and intensity is also relevant, as rain is known to be heavier and more persistent compared to drizzle, but that does not primarily define the two. Additionally, drizzle is not limited to winter months, as it can occur in various seasons as long as the atmospheric conditions support the formation of small droplets.

Therefore, the correct choice emphasizes the critical difference in droplet size, which influences the classification of precipitation types in meteorology.