What does the letter "D" stand for in a METAR report regarding dew point?

In a METAR report, the letter "D" is used to signify the dew point temperature. Dew point is a crucial meteorological measurement that indicates the temperature at which air becomes saturated with moisture. This measurement is important for understanding humidity conditions, potential fog formation, and overall weather forecasting.

The dew point is typically presented in degrees Celsius or Fahrenheit, and it provides pilots and meteorologists with essential information about the amount of moisture in the air. A higher dew point indicates more moisture, while a lower dew point suggests drier air. This information is particularly valuable for flight operations, as it impacts visibility and aircraft performance.