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A temperature anomaly is measured against a reference value (also called baseline period or long-term average). [42] Usually it is a period of 30 years. For example, a commonly used baseline period is 1951-1980.
This iconic graph adapted from MBH99 was featured prominently in the WG1 Summary for Policymakers under a graph of the instrumental temperature record for the past 140 years. The text stated that it was "likely that, in the Northern Hemisphere, the 1990s was the warmest decade and 1998 the warmest year" in the past 1,000 years. [68]
An early (2018) warming stripes graphic published by their originator, climatologist Ed Hawkins. [1] The progression from blue (cooler) to red (warmer) stripes portrays annual increases of global average temperature since 1850 (left side of graphic) until the date of the graphic (right side).
Data are provided as temperature anomalies against the seasonal average over a past basis period, as well as in absolute temperature values. The baseline period for the published temperature anomalies was changed in January 2021 from 1981-2010 to 1991-2020. [4] All the data products can be downloaded from the UAH server. [5]
Multiple independent datasets all show worldwide increases in surface temperature, [55] at a rate of around 0.2 °C per decade. [56] The 2014–2023 decade warmed to an average 1.19 °C [1.06–1.30 °C] compared to the pre-industrial baseline (1850–1900). [57]
Higher than normal temperatures are shown in red and lower then normal temperatures are shown in blue. The final frame represents the global temperatures 5-year averaged from 2014 through 2018. Scale in degree Celsius." "These calculations produce the global average temperature deviations from the baseline period of 1951 to 1980."
He points out that, as you get older, your baseline temperature may get lower. As a result, you may feel feverish at a temperature lower than 100.4 degrees.
A climate spiral (sometimes referred to as a temperature spiral [3] [4]) is an animated data visualization graphic designed as a "simple and effective demonstration of the progression of global warming", especially for general audiences.