San Francisco International Airport recorded only 0.20 of an inch of rain during January 2013, and as of Feb. 5, no rainfall has been added to this amount.
The prior driest January on record was in 1991, when 0.24 of an inch of rain fell.
A northward bulge in the jet stream, known as a ridge, delivered the dry weather much of the past five weeks.
Link: http://www.accuweather.com/en/weather-news/san-francisco-record-dry-start-to-year/5621528
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