September Sea Surface Temperatures (SSTs) are now available, and we see downward spikes in ocean temps everywhere, led by sharp decreases in the Tropics and SH, reversing the bump upward last month. The Tropical cooling in particular factors into forecasters favoring an unusually late La Nina appearance in coming months.
HadSST is generally regarded as the best of the global SST data sets, and so the temperature story here comes from that source, the latest version being HadSST3.
The chart below shows SST monthly anomalies as reported in HadSST3 starting in 2015 through September 2017.
The August bump upward was overcome with the Global average matching the lowest level in the chart at February 2015. September NH temps almost erased a three-month climb; even so 9/2017 is well below the previous two years. Meanwhile SH and the Tropics are setting new lows for this period. With current reports from the…
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