How are cloud base heights reported in METAR reports?

In METAR reports, cloud base heights are standardized to be reported using three digits, which represent the height above ground level in hundreds of feet. For instance, a value of "020" signifies a cloud base at 2,000 feet, and "100" would indicate a base at 10,000 feet. This specific format allows for clear and unambiguous communication regarding cloud heights, which is essential for pilots and meteorologists in understanding flight conditions.

The reporting format effectively conveys critical information in a concise manner, which aligns with the aviation industry's need for quick interpretation. This is why the other formats, such as feet and inches, meters, or thousands of feet, are not utilized in standard METAR reports. The chosen method enhances clarity and consistency across different reports and locations.