Please disregard. Ambient says NO.
Ambient put you in error. .csv Files with measurement data are created on your storage card (SD) in the directory EasyWeather when doing backup. For these files you can access through your SD card or USB cable. You can edit the file in Excel and load it on (SD). Only, I do not understand why?
The station (console) stores
in its memory the data-to-date directory EasyWeather / Database (extension .dat) - example 2016.dat or 2017.dat. These files can not be modified by the entrance to them - unfortunately.