How can I import Excel files with data recorded in intervals other than one hour?
The Import from Excel utility can only accept data in an hourly record format, however; it is possible to trick WRPLOT View. For example, if the data is recorded every 15 minutes, each record can be entered as a new hour. This will result in the dates and times being incorrect, but the wind rose and frequency distribution should be unaffected.
Note that this is a workaround solution only, dates and times in your file will be incorrect.