What data can I get from other sources to put into HOMER Pro?
There are two major options.
Option 1: Use long-term monthly averages
If you have a large dataset, you could calculate the long-term average wind speed for each month of the year, enter those monthly averages in HOMER Pro's Wind Resource Inputs window along with the long-term Weibull k and diurnal pattern parameters, and have HOMER Pro synthesize hourly data.
Some tools, such as Windographer, will let you can cut and paste the averages from external programs into HOMER Pro. HOMER Pro also lets you copy and paste from Excel.
If you have performed advanced statistics, I would also set the specific Weibull k, diurnal pattern strength, hour of peak wind speed, and one-hour autocorrelation coefficient, if they are available from the dataset. If you don't know what to put, you can use HOMER Pro's default values; the default values are all preset to reasonable values for a typical system.
Option 2: Use one year of the data set
You could instead choose the one calendar year that most closely matches the ten-year average wind speed, and import that for use in HOMER Pro. HOMER can accept one year of data at timesteps down to a minute.
Use File / Export to export just the wind speed column to a text file, then edit the text file in a spreadsheet to contain only the one year of data -- exactly one year starting January 1st. Also remove any date/time column and header rows. HOMER Pro requires the file to contain only one column of numbers, with one time step per line, starting January 1st. HOMER also can't handle gaps in the data, so you might need to fill-in gaps before exporting the data.
Once you have created the text file and stripped it down as I have described, you can import it directly into HOMER Pro's Wind Resource Inputs window. You can set the simulation time step in the Project ribbon, under the Optimization window. If you select a shorter timestep than your imported data, HOMER Pro will break your dataset steps into identical shorter wind speeds. If you select a longer timestep than your imported data, HOMER Pro will average and interpolate appropriately.
If you are more concerned with getting an accurate picture of the seasonal variability in the wind, use the first option. If you are more concerned with getting an accurate picture of the hour-to-hour and day-to-day variability, use the second option.