DataHub v1 is the original DataHub catalog of 11,000+ open datasets, now migrated to PortalJS Arc.
Dataset

JMA Global Surface Temperature Anomaly

Global surface temperature anomalies gridded into a 5x5 degree grid. The 1971 to 2000 average is used as the climatology normal.

Download & API
gst_mon_1891_last.gzcompressed ascii
monthly anomalies
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gst_ann_1891_last.gzcompressed ascii
yearly anomalies
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Sources & license