change ground temperature in openstudio [closed]

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I would like to change the ground temperature from 18 degrees to 12 throughout the whole year in my openstudio model .I found some previous threats related to that but all involved some script writing since the temperature was not the same throughout the year. Since my case is simpler than this, is there a way that does not involve script writing since I do not have the slightest clue on how to do it? Thank you

Desperate!