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Archive for the ‘Precipitation’ Category

In follow up to my prior post regarding historical precipitation data for San Jose, California, I have now plotted the annual precipitation for the Northern Sierra 8 Station index maintained by the California Department of Water Resources.  The data are available at the California Data Exchange Center here:

The data do not go back quite as far as the San Jose data I previously showed (1921 rather than 1875), but do give us 90 years of data covering a much broader geographical area.  Again, in light of my friend’s recent concern about changing precipitation patters due to global warming (he was specifically concerned about reduced precipitation, not increased), what do the data for this large portion of the California Sierras show?

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Recently a friend and I were talking about precipitation and he suggested that global warming was contributing to changing precipitation patterns around the world.  This reminded me of something I had looked into a few years ago, so I thought I would share it.

In 2007-2008 there was some discussion in the news about the low rainfall in the San Francisco Bay Area.  As is often the case, some commentators ascribed the low rainfall to global warming. I was curious about what the precipitation data actually showed and did a bit of searching online for the historical data, finally finding data back to 1875 for San Jose.

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