What does the symbol ($) in a METAR indicate?

The symbol ($) in a METAR indicates that weather observations are from an automated system. This symbol signifies that the temperature and dew point information reported in the METAR were gathered by automated meteorological equipment, which can enhance accuracy and reliability by capturing real-time data without human error or bias.

Understanding the role of automated weather reporting is crucial for dispatchers and other aviation professionals, as it provides valuable, timely information that can impact flight operations, safety, and decision-making. Automated systems can deliver METAR updates more frequently than manual observations, allowing for more current and relevant data to be utilized for flight planning and en route decisions.