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That's heavy precipitation chart, not overall precipitation. Heavy precipitation can flatten your crop.

Change in precipitation is not same all in US. Some areas become very dry, some others get more than enough.

http://eoimages.gsfc.nasa.gov/images/imagerecords/83000/8362...

The time period isn't indicated on that map, but since I'd like to see the dairy industry leave Arizona and move back to the Midwest where it naturally belongs, I frankly don't see a problem there. The sooner they have to stop irrigating their alfalfa, the better.

No American farmer would need a chart to be thankful not to face 1930s' conditions.

According to the URL, it appears to be 1991-2012 changes in precipitation. I suspect the filename is trustworthy (based solely on it coming from NASA) but it might not be.

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