On metar report wbd 0.9 what does it mean?

Answer 1

Wet Bulb Depression. The difference between the dry- and wet-bulb temperatures. Used when temp and dew point are close together.

Answer 2

The METAR report "WBD" stands for Weather Buoy Data, indicating that the weather observation is coming from a weather buoy. The number following "WBD" (e.g., 0.9) typically refers to the distance in nautical miles from the reporting station to the weather buoy where the observation was taken. In this case, "0.9" would indicate that the observation was taken from a weather buoy located 0.9 nautical miles away from the reporting station.