What does "933 group" mean in a METAR report?

The "933 group" in a METAR report refers specifically to the water content of snowpack, expressed in millimeters. METAR reports include observations of various weather phenomena, and among these, the water equivalent of snowfall is indicated using this code. The "933" signifies that the snow contains a specific amount of water, which can help in assessing moisture content and potential melting, relevant for understanding weather conditions and forecasting.

On the other hand, other options pertain to different types of weather data not represented by "933." For instance, snowfall amounts would typically be described in different terms, while temperature readings are given in degrees Celsius or Fahrenheit. Wind speed is represented separately in METAR reports, indicating how wind conditions are affecting the area. Thus, the focus on "933" distinctly identifies it as related to snowpack water content.