Here in San Francisco, the common sauna wisdom is that we just experienced one of the warmest winters in recent memory. The Dolphin Club’s Polar Bear Challenge was hardly challenging, and the South End’s “Dreaded 9th” of February swim was hardly dreaded.
Just how warm was it, though? I crunched the numbers from the NDBC, because, well, why not.
Here we see the last 15+ months of data from the Crissy Field station (FTPC1) inside San Francisco Bay, plotted in solid black. The dashed green, red, and blue lines show the long-term average, maxima, and minima for each day of the year, summarized over the eight years of available data from that station.
From July 2014 until just the past few days (early April 2015), Bay waters have been hovering 2-3 degrees (F) above the all-time highs (going back to 2006), and about 5 degrees above the long-term averages.
Eight years isn’t much data, unfortunately. Can we do better?