The time period of the 24/48/72 hour snowfall box and whisker plots are off by a day. They should be plotting one day forward from where they are currently plotting. 
From this image, notice the 1 hr, 6hr are a day ahead of the 24 hr box and whisker plot. https://drive.google.com/file/d/1IFyrHHj5BtMDJMemj2znY8oxRZPcYYwJ/view?usp=sharing