Extract raster value into polygon

I'm a bit new in QGIS world.

I have the raster map of monthly precipitation of some years (download from CGIAR http://www.cgiar-csi.org/data/uea-cru-ts-v3-10-01-historic-climate-database) and I need the mean values on a specific area (polygonal shape file). I tried with zonal statistic but I had not results, the attribute table was empty. It's possible that my region it's too small for do this?

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Category: raster Time: 2016-07-31 Views: 0

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