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Monthly SST Anomaly: global
Is sea surface temperature warmer or cooler than usual?  

Colors on this map show where and by how much monthly sea surface temperature differed from its 1981 to 2010 average. Red and orange areas were warmer than average, and blue areas were cooler than average. The darker the color, the larger the difference from the long-term average. White and very light areas were near their three-decade average.

Where do these measurements come from?  

These monthly measurements are from NOAA’s Optimum Interpolation Sea Surface Temperature (OISST). The observations are from multiple sources: satellites, ships, and buoys. Scientists combine data from the different sources, and data visualizers plo...

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