Daily rainfall figures – Van Nuys, California 91316 for October, 2011
I believe the rainfall for 2010-2011 is not reported as much as it ordinarily is because that rainfall is greatly above normal. If that fact were widely reported, people would tend to use more water. James
More than likely has to do with you requesting such a large geographical area. Narrow it down to a county and you should be able to get you answer. For example; Los Angeles is at 18.73 inches for the year on the rain calendar which is 123% of normal. this total is from March 21st 2011.