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The blue line represents global surface temperature reconstructed over the last 2,000 years using proxy data from tree rings, corals, and ice cores. [1] The red line shows direct surface temperature measurements since 1880. [2] Global surface temperature (GST) is the average temperature of Earth's surface.
The initial version of Global Historical Climatology Network was developed in the summer of 1992. [3] This first version, known as Version 1 was a collaboration between research stations and data sets alike to the World Weather Records program and the World Monthly Surface Station Climatology from the National Center for Atmospheric Research. [4]
The current multi-century period is the warmest in the past 100,000 years. [3] The temperature in the years 2011-2020 was 1.09 °C higher than in 1859–1890. The temperature on land rose by 1.59 °C while over the ocean it rose by 0.88 °C. [3] In 2020 the temperature was 1.2 °C above the pre-industrial era. [4]
From 1978 onward CRU began production of its gridded data set of land air temperature anomalies based on instrumental temperature records held by National Meteorological Organisations around the world. In 1986 sea temperatures were added to form a synthesis of data which was the first global temperature record, demonstrating unequivocally that ...
— In the NOAA wab page, choose 12-Month timescale, December, 1880-2019, Global, Land and Ocean, Plot. — Data uses 1901-2000 base period (=0°C in the chart). Actual data for this chart is provided in expandable text, below.
The global temperature was about 1.5 degrees Fahrenheit over the 1991-2020 average for the month of February, and about 0.2 degrees warmer than the previous February record.
World leaders are meeting in Paris this month in what amounts to a last-ditch effort to avert the worst ravages of climate change. Climatologists now say that the best case scenario — assuming immediate and dramatic emissions curbs — is that planetary surface temperatures will increase by at least 2 degrees Celsius in the coming decades.
— In the NOAA wab page, choose 12-Month timescale, December, 1880-2019, Global, Land and Ocean, Plot. — Data uses 1901-2000 base period (=0°C in the chart). Actual data for this chart is provided in expandable text, below. FYI: Data, adjusted for a different base period, is used in the top half of uploader RCraig09's other image file: File ...