This part (the hex data)>
000100, 05 41 CC 00 4D AC 00 13 27 11 22 00 08 00 00 00 ,

Seems to be the only data I can actually see being sent from the display unit to the PC via the USB link. So from that, the rest of the data must be being decoded by the software to be placed in the easyweather.dat file.

The date + time stamp in the file at the star of each line is obtained from the PC's internal clock.