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 , 3:10 AM GMT on June 05, 2013
Temperatures: May 2013 went in reverse from the normal, gradually became cooler through the month, especially the Minimums. A few warm periods occurred on the Max. Temp. side but none lasted long. Only 9 days reached ≥ 80°, 4 of which were ≥ 90°; conversely, 20 days remained below 70°, 10 of which stayed below 65°. In fact, the Avg. Max. Temp. was 0.8° cooler than April 2013, the May Mean Temp. only 0.7° warmer. No Min. Temps. were warmer than 55° after the 3rd of the month. Oddly, no Mins dropped below 50° until the 21st, then continued in the 40's through the 25th. The greatest diurnal range of 40.6° occurred on the 31st, the least was 9.6° on the 16th.
Precipitation: Rainfall was nearly non-existent, continuing the record-dry beginning to the year. With only 0.02" (0.01" on 2 different days), May received only 2.7% of the Monthly Normal of 0.74". This brings the 2013 Calendar-Year total to a paltry 2.28", only 13.5% of the normal of 16.87" for this 5-month period. For the Water Year, the total is now up to 13.96", 53.3% of the Normal of 26.17" for the period July 1, 2012-May 31, 2013.
Wind: All 31 days recorded peak gusts of ≥10 MPH, with 25 of these being ≥ 15 MPH, and 12 being ≥ 20 MPH.
Fog: The dry conditions led to only 4 days with Fog, 2 of these being Heavy (<1/4 Mile visibility).
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