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What caused this past winter's abnormal dryness in SLO County?

June 25, 2013

January through June in San Luis Obispo will go down as the third driest such period on record at Cal Poly (home of climatology for the city) since 1870, when weather observations started. Since January, Cal Poly has recorded only 3.5 inches of rain. Normally, it should be about 15 inches.