What is the meaning of "2/3" in the context of the image?

The characters "2/3" are written in blue ink on the image, and they appear above the table. Given the context of the table which is about average temperatures in different climate zones, these characters likely represent a date or a measurement related to the information presented. Without further context or a clear indication of what they refer to within the table's structure, it is impossible to definitively determine their meaning. They could be a page number, a reference, or a specific data point not directly tied to the table's columns and rows.