Since 1872, MMWD has been keeping records of daily rainfall levels at Lake Lagunitas—the oldest of our seven reservoirs. We’ve been posting the history of this rainfall on our website in a graphical format to illustrate the trends over this more than century-long period. In addition to the graph of annual rainfall, we’re now also posting daily rainfall levels so you can see exactly how much rain fell yesterday, last week or last month. For comparison, we’ve also included daily rainfall levels for the prior year and average rainfall levels.
The rainfall year differs from the calendar year, running from July 1 to June 30. Rainfall at Lake Lagunitas varies significantly, with annual totals ranging from 18 to 112 inches. The average annual rainfall is 52 inches. Our current cumulative rainfall for July 1, 2009 to February 28, 2010 is 39 inches, which is 99 percent of our average rainfall for this period.
The rainfall this year has filled our seven reservoirs to 94 percent of capacity (as of February 28) compared with 78 percent at this time last year.
The new daily rainfall chart will be updated every Monday during the rainy season, along with our usual weekly water watch report of consumption, storage and temperature. Please visit our Reservoirs web page and click on Daily Rainfall at Lake Lagunitas at the bottom of the page.