According to this website:
http://www.wrcc.dri.edu/htmlfiles/westwinddir.html#ARIZONA
For 9 months, it's East, the other 3, it's West.
YMMV
Any way it wants to (it's the wind, after all)

Here's a crop of Phoenix weather for the entire year from Jan 1, 2011 - Dec 31, 2011:

Interesting. I was just thinking about Palo Verda Nuclear Generating Station.
DON'T think about it and life is much easier.
Originally Posted By Dace:
Interesting. I was just thinking about Palo Verda Nuclear Generating Station.
I was thinking you meant the political winds which sometimes gust from left to right but are generally a slow breeze from right to left
Originally Posted By Dace:
Interesting. I was just thinking about Palo Verda Nuclear Generating Station.
I'm at PVNGS and my account is it clocks from east to west most days.
Edit: Comes from east in the morn and clock around to come from the west by midday.