cumulative sum of degree.days HadSST3 NH volcano stack

Equivalent graph for southern hemiphere SST:
https://climategrog.wordpress.com/?attachment_id=312

For explanation of derivation see description accompanying a similar graph of HadCRUT4 data:

https://climategrog.wordpress.com/?attachment_id=285

The volcano stack of hadSST3 without integration of degree.days is here:
https://climategrog.wordpress.com/?attachment_id=278

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