What does the "Remarks" section of a METAR report contain?

The "Remarks" section of a METAR report is designed to provide additional information that is not included in the standard parts of the METAR format. This section can encompass a wide range of data that may be pertinent to the weather observation, such as significant weather phenomena that are not otherwise included, details about runway conditions, information regarding recent weather events, or explanations of phenomena that could affect aviation operations.

For example, if there are unusual weather conditions or notable observations such as recent snowfall accumulation or changes in visibility, these would typically be found in the "Remarks" section. By providing this additional context, pilots and meteorologists receive a more comprehensive understanding of the current weather situation, which is crucial for safety and decision-making in aviation.

Other options do not accurately represent the content of the "Remarks" section. The section does not contain only temperature data, does not serve as a repository for historical weather data, nor does it include forecast information, as forecasts are typically found in TAF reports rather than METARs.