Radiation result error of compraring different weather data sources

Hello everyone,

I tested two weather data in a radiation study :

The global horizontal radiation is almost the same, but the simulation with Honeybee doesn’t give the same result on a horizontal surface.

Can anyone tell me why one result is twice higher than the other one?

the two weather data are from:



tmy_34.019_-6.804_2005_2014.zip (239.8 KB)

Here is the GH file :
Compar weather.gh (515.0 KB)

Really appreciate your help.

Best regards,