What does "light snow" represent in a METAR report context?

"Light snow" in a METAR report refers to the intensity of the snowfall, which is indicated by measurements such as the rate of accumulation. Specifically, the correct explanation is that "light snow" signifies a snowfall intensity of less than 2.5 mm per hour.

This definition is part of the standardized language used in aviation meteorology to help pilots and meteorologists quickly understand weather conditions. By quantifying the intensity of the snowfall, it allows for a more precise assessment of how it may affect visibility and aircraft operations. Thus, in the context of METAR reports, this measurement is critical for safety and operational planning in aviation.

In contrast, the other options don’t accurately capture the official interpretation of "light snow" in the METAR context. For instance, while snow accumulation less than 1 inch could happen, it doesn't universally define "light snow," as the intensity also considers the rate of snowfall. Snowfall that does not stick to the ground refers more to the ground conditions rather than the intensity of falling snow. Additionally, "snow that is falling lightly and visible" lacks the quantitative aspect that is fundamental to defining snowfall conditions in METAR reports.