Average global temperatures
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Global Average Surface Temperature: Historical and Recent Estimates
The global average surface temperature has been a key indicator in climate change research. Historical records show that the annual average surface temperature of the world is about 14.0°C, with the Northern Hemisphere averaging 14.6°C and the Southern Hemisphere 13.4°C. The global mean temperature follows a seasonal cycle, peaking at 15.9°C in July and dipping to 12.2°C in January . More recent remote sensing data from 2001 to 2012 estimate the global mean surface temperature at approximately 14.35°C .
Long-Term Warming Trends and Rates
Over the past 150 years, global temperatures have risen significantly. Notably, two periods of rapid warming occurred: from 1925–1944 (0.37°C increase) and from 1978–1997 (0.32°C increase) . Since 1880, the Earth's temperature has increased at a rate of 0.08°C per decade, with the rate more than doubling to 0.18°C per decade since 1981 . Analyses of global monthly temperature records from 1881 to 2013 indicate an average incremental temperature increase of about 1.33°C, with "low" and "high" monthly temperature increments of 0.9°C and 1.78°C, respectively .
Recent Decades: Accelerating Warming and Regional Differences
In the 21st century, warming has continued and even accelerated in some regions. From 2001 to 2020, the global average land surface temperature increased at a rate of 0.26°C–0.34°C per decade. The Arctic, Europe, and Russia experienced especially rapid warming, with the Arctic warming at 2.5–2.8 times the global average and some Arctic permafrost regions exceeding 2°C per decade . Despite the overall warming trend, some regions, such as parts of the Pacific Ocean, northern Atlantic, and certain land areas, have experienced cooling or less pronounced warming .
Record-Breaking Years and Recent Observations
The years 2015–2020 are virtually certain to have been the six warmest years in recorded history, with 2020 having a 44% probability of being the warmest year on record . In 2017, global temperatures ranked as the second or third highest since records began, and it was the warmest non-El Niño year ever recorded . The first half of 2023 saw the third warmest global mean surface temperature since instrumental records began, with projections suggesting that 2023 could surpass previous records, reaching an anomaly of about 1.26°C above pre-industrial levels .
Impacts and Environmental Consequences
Rising global temperatures have led to a decrease in areas affected by exceptionally cool temperatures and an increase in areas experiencing exceptionally warm temperatures . The warming has also resulted in reduced Arctic sea ice, record high ocean heat content, and widespread coral bleaching events . These changes have significant implications for ecosystems, weather patterns, and human societies .
Conclusion
Global average temperatures have risen markedly over the past century and a half, with the rate of warming accelerating in recent decades. The world’s average surface temperature is now over 1°C higher than pre-industrial levels, with recent years consistently breaking historical records. While the overall trend is clear, regional variations and short-term fluctuations continue to be observed. The ongoing rise in global temperatures underscores the urgent need for continued monitoring and action to address climate change Jones1999Mao2017Craigmile2021+5 MORE.
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