In a METAR, what does the 'T' group signify?

The 'T' group in a METAR report signifies specific temperatures reported on the hour. This group is typically presented in degrees Celsius and helps pilots and meteorologists understand the current temperature at the reporting station precisely. It can be crucial for various aviation operations, such as assessing performance and ensuring safety in flight by providing accurate temperature data.

By including this temperature information, the 'T' group enhances the detail and usability of the METAR report, allowing users to make informed decisions based on real-time observations. The use of specific temperatures rather than general indications or supplementary data ensures clarity and precision in meteorological reporting.