My run period in OpenStudio Simulation Settings goes from 1 Jan to 31 Dec and some selected Output variables are setted on "Monthly".
Why monthly charts in Results Viewer shows values from 3 March to 31 January (February is completely missing) ? The daily charts don't have this problem going from 1 Jan to 31 Dec.
I haven't used monthly OutputVariables, so I'm not sure how to trouble shoot in ResultsViewer. However, you can try DView which allows you to view hourly CSV data in hourly, daily, and monthly format.
OpenStudio doesn't create a CSV file of the OutputVariables but you can follow the steps from my comment in this question to create the out.csv file to open in DView. Note that the out.csv headers aren't technically in DView format so will appear as a list without collapseable categories.
EnergyPlus Output:Variable CSV file opened in DView 
DView formatted file 
Thank you for your reply. Unfortunatly when I open csv file in DView I get the following error: "The selected file is not of the correct format, is corrupt, no longer exists or you do not have the permission to open it"
@marika - I just checked and was able to open a out.csv file after running the out.idf created by OpenStudio. A couple things to check:
If you're using the measure Add Output Variable make sure the string you enter in the textbox matches the variable name from the out.rdd file exactly.
If you're using the built in outputs from OpenStudio, make sure to request hourly. I'm not sure, but DView might need 8760 data.
Thank you @MatthewSteen. As you said, with "hourly" setting in the Output Variables D-View works perfectly.
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