How is calm wind coded in the body of a weather report?

In a weather report, a calm wind is encoded as "00000KT." This coding indicates that there is no significant wind at the observing location, with the first five digits representing the wind direction in degrees and the "KT" indicating the wind speed is measured in knots. Since the wind is calm, both the speed and the direction are reported as zero.

In contrast, the other options include elements that suggest either a light breeze or additional weather phenomena that are not indicative of calm conditions. For instance, options with non-zero speeds or gusts indicate some level of wind activity which would not correctly represent calm conditions. Therefore, the standard and accepted way to denote calm wind in a surface weather report is simply "00000KT," as it accurately reflects the absence of wind.