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A comment on Why is the Northwest so warm?. Parent comment

Re:Why is the Northwest so warm? by johnchristopher on Friday July 03, 2015 @08:47AM (#9825192)
How can there be a temperature reading of 0º on the 2nd of July in NW France ? http://3.bp.blogspot.com/-DOcnQQULMfs/VZVSXCvJdiI/AAAAAAAAQu...

What am I reading wrong ?

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Re:Why is the Northwest so warm? by wyago on Friday July 03, 2015 @08:54AM (#9825232)
I'm not totally familiar with this diagram, but I think that by "Temperature Anomaly" they mean the difference between the temperature and what we expected the temperature to be (or something like that), not the absolute temperature.
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Re:Why is the Northwest so warm? by johnchristopher on Friday July 03, 2015 @09:01AM (#9825273)
Ah, I get it now. Thanks.
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Re:Why is the Northwest so warm? by zimpenfish on Friday July 03, 2015 @08:51AM (#9825217)
I think that 0º is the "temperature anomaly" - i.e. it's exactly what they're expecting.
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