Wind rose of Jerusalem

Where does the wind blow from in Jerusalem? I was wondering because I needed to know how to get fresh air in the evenings into our (future) apartment.

I couldn't find the information, so I pulled two years' worth of meteorological data (2011 & 2012) for Jerusalem from http://data.gov.il/ims and set about to create a graphic view of the wind direction, weighted by its speed, in Excel. Here's the result:

Unquestionably, the dominant direction is from the West (West-North-West to be accurate), and especially so in the summer!

There's more to it as one could not weight by wind speed (taking into account values only above a given threshold), or on the contrary weight by something more meaningful, e.g. wind energy - but I'm not interested in putting up a wind turbine at this stage! - but I'll post more on this later if prompted.