How does one operate the ECC3 compensation event clause 60.1(13) for weather?

How does one operate the ECC3 compensation event clause 60.1(13) for weather? is abnormal weather payable?

This one of the compensation events which the Contractor needs to notify at the end of each calendar month and which shows that the weather measurement in comparison to the weather data canbe shown to have occurred less frequently than once in ten years.