State of the Lake 2009 - Tahoe Environmental Research Center ...
State of the Lake 2009 - Tahoe Environmental Research Center ...
State of the Lake 2009 - Tahoe Environmental Research Center ...
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Percent<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
METEOROLOGY<br />
TAHOE: STATE OF THE LAKE REPORT <strong>2009</strong><br />
Snow as a fraction <strong>of</strong> annual precipitation<br />
Yearly since 1910<br />
Snow has declined as a fraction <strong>of</strong> total<br />
precipitation, from an average <strong>of</strong> 52<br />
percent in 1910 to 34 percent in present<br />
times. In <strong>Tahoe</strong> City, snow represented<br />
65 percent <strong>of</strong> 2008 total precipitation,<br />
a marked increase over recent years.<br />
These data assume precipitation falls<br />
as snow whenever <strong>the</strong> average daily<br />
air temperature is below freezing.<br />
(Precipitation is summed over <strong>the</strong><br />
Water Year, which extends from<br />
October 1 through September 30.)<br />
1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010<br />
Water Year<br />
7.7
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