I live in the San Francisco Bay Area and have always had a fascination with weather, its extremes, and stats. I'm also in CoCoRaHS: Belmont 0.7 WSW.
By: BelmontJeff , 3:18 PM GMT on February 01, 2013
180°!!! That's the direction that precipitation took this month compared to last month. After receiving a total of 6.47" and 15 days with measureable rain in Dec. 2012, January 2013 totaled only 0.35" and 7 days of measureable rain (three were only 0.01" and one 0.02"). This month's total was only 6.5% of the 30-year normal of 5.41" for January, whereas December was 136% of the 4.74" normal. As would be expected with such dry weather, many clear days were a result.
Temps: Avg Maxs for the first half of the month were typical for this time of year but Avg Mins were chilly, averaging 40.9° over the first 16 days, with many frosty mornings, especially at protected, lower elevations. The later half of the month saw warming, with Mins averaging 46.7° from the 17th-31st.
There was unusually little fog or wind this month. Only 8 days of Fog occurred (none were less than 1/4 mile). The highest wind gust was only 13 MPH from the NW on the 28th (only 7 days averaged greater than 1.0 MPH (with just 2 of these between the 1st and 25th).
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