the graphic tab doesn't refresh; but the values in the WeatherWatcher driver main tab are regularly updated?
if this is the case I would say is an issue of communication between the driver and the weather tab else it is the driver that fails reading the data from file.

To rule out any data format issue, can you try using the exact format provided in the driver manual (e.g. safe as numeric)?
dataGMTTime=2019/03/16 13:13:40
clouds=-11.430000
temp=27.810000
wind=4
rain=2432
light=0
switch=0
safe=0

If this doesn't help, sending the log file could help to understand the cause.
Ferrante

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