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The IPCC Fifth Assessment Report (AR5 WG1) of 2013 examined temperature variations during the last two millennia, and concluded that for average annual Northern Hemisphere temperatures, "the period 1983–2012 was very likely the warmest 30-year period of the last 800 years (high confidence) and likely the warmest 30-year period of the last ...
1816 is known as the Year Without a Summer because of severe climate abnormalities that caused average global temperatures to decrease by 0.4–0.7 °C (0.7–1 °F). [1] Summer temperatures in Europe were the coldest of any on record between 1766 and 2000, [2] resulting in crop failures and major food shortages across the Northern Hemisphere. [3]
The dates vary each year due to the difference between the calendar year and the astronomical year. Within the Northern Hemisphere, oceanic currents can change the weather patterns that affect many factors within the north coast. Such events include El Niño–Southern Oscillation. Trade winds blow from east to west just above the equator.
Lowest temperature in the Northern Hemisphere: −69.6 °C (−93.3 °F); Greenland Ice Sheet, Greenland on 22 December 1991. [ 196 ] Coldest average monthly temperature in the Northern Hemisphere : −54.1 °C (−65.4 °F); Oymyakon , Russia for the month of January 1931.
The AR4 SPM statement was that "Average Northern Hemisphere temperatures during the second half of the 20th century were very likely higher than during any other 50-year period in the last 500 years and likely the highest in at least the past 1,300 years. Some recent studies indicate greater variability in Northern Hemisphere temperatures than ...
Huelmo–Mascardi Cold Reversal cold in Southern Hemisphere: 10,800–9,500: Younger Dryas sudden cold and dry period in Northern Hemisphere (B-S) 9,500–5,500: Holocene climatic optimum A warm period about 4.9 °C warmer than the LGM
The IPCC Fifth Assessment Report (AR5 WG1) of 2013 examined temperature variations during the last two millennia, and cited the following reconstructions in support of its conclusion that for average annual Northern Hemisphere temperatures, "the period 1983–2012 was very likely the warmest 30-year period of the last 800 years (high confidence ...
Tombstone in the chapel of Filippo e Giacomo, Nosedo, dated to AD 536 (the second year after the consulship of Decius Paulinus). The volcanic winter of 536 was the most severe and protracted episode of climatic cooling in the Northern Hemisphere in the last 2,000 years. [1]