![]() For more information, please visit NCEI's Global Surface Temperature Anomalies page. Temperature anomalies for land and ocean are analyzed separately and then merged to form the global analysis. The anomaly map on the left is a product of a merged land surface temperature ( Global Historical Climatology Network, GHCN) and sea surface temperature ( ERSST version 5) anomaly analysis. ![]() Temperature anomalies and percentiles are shown on the gridded maps below. ![]() The average position of the upper-level ridges of high pressure and troughs of low pressure-depicted by positive and negative 500-millibar height anomalies on the September 2021 map, is generally reflected by areas of positive and negative temperature anomalies at the surface, respectively. In the atmosphere, 500-millibar height pressure anomalies correlate well with temperatures at the Earth's surface.
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