How often are the maximum and minimum temperatures recorded in the METAR report?

The maximum and minimum temperatures in a METAR report are recorded every 6 hours. This frequency aligns with the standard practice of updating weather observations at regular intervals, allowing for timely and relevant data about temperature extremes over the most recent period. The purpose of capturing maximum and minimum temperatures at this interval is to provide a clear picture of diurnal temperature changes, which are essential for understanding daily weather patterns.

In contrast, other options imply different frequencies of observation. Maximum and minimum temperatures are not recorded hourly, daily, or every 12 hours in the METAR reporting system, which is why those choices do not apply here. By focusing on the 6-hour interval for these specific temperature extremes, METAR reports effectively convey significant variations in temperature that may impact weather forecasts and analyses.