How is the minimum temperature in the last 24 hours represented in the METAR report?

In a METAR report, the minimum temperature recorded in the last 24 hours is typically indicated following the notation “M” to signify that the temperature is below 0 degrees Celsius. In this case, the temperature of -0.7°C indicates that the minimum temperature reached was just below freezing, which accurately reflects a negative value.

When interpreting METAR data, understanding the format is key. The letter "M" before the temperature value signifies a minimum temperature, and the negative value indicates the temperature is sub-zero. Therefore, -0.7°C shows that during the previous 24 hours, the lowest temperature recorded in that specific location was a little below zero.

Other options that present positive temperatures or do not contain the necessary indication of a negative value fail to represent the minimum temperature correctly as per standard METAR reporting.