Editing Winter (section)

===Exceptionally cold===
[[File:Frost Fair of 1683.JPG|right|thumb|upright=1.2|[[River Thames]] frost fair, 1683, with [[London Bridge#Old London Bridge (1209–1831)|Old London Bridge]] in the background]]
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*1683–1684, "The Great Frost", when the [[Thames]], hosting the [[River Thames frost fairs]], was frozen all the way up to [[London Bridge]] and remained frozen for about two months.  Ice was about {{convert|27|cm|abbr=on}} thick in London and about {{convert|120|cm|abbr=on}} thick in Somerset. The sea froze up to {{convert|2|mi}} out around the coast of the southern [[North Sea]], causing severe problems for shipping and preventing use of many harbors.
*1739–1740, one of the most severe winters in the UK on record. The Thames remained frozen over for about 8 weeks. The [[Irish Famine (1740–1741)|Irish famine of 1740–1741]] claimed the lives of at least 300,000 people.<ref>{{cite book|author=Cormac O Grada|title=Famine: A Short History|url=https://books.google.com/books?id=LoN2XkjJio4C&pg=PA23|year=2009|publisher=Princeton University Press|isbn=978-0-691-12237-3|page=23}}</ref>
*1816 was the [[Year Without a Summer]] in the Northern Hemisphere. The unusual coolness of the winter of 1815–1816 and of the following summer was primarily due to the eruption of [[Mount Tambora]] in Indonesia, in April 1815.  There were secondary effects from an unknown eruption or eruptions around 1810, and several smaller eruptions around the world between 1812 and 1814.  The cumulative effects were worldwide but were especially strong in the Eastern United States, Atlantic Canada, and Northern Europe. Frost formed in May in New England, killing many newly planted crops, and the summer never recovered. Snow fell in New York and Maine in June, and ice formed in lakes and rivers in July and August. In the UK, snow drifts remained on hills until late July, and the Thames froze in September. Agricultural crops failed and livestock died in much of the Northern Hemisphere, resulting in food shortages and the worst famine of the 19th century.
*1887–1888: There were record cold temperatures in the Upper Midwest, heavy snowfalls worldwide, and amazing storms, including the [[Schoolhouse Blizzard]] of 1888 (in the Midwest in January) and the [[Great Blizzard of 1888]] (in the Eastern US and Canada in March).
*In Europe, the winters of early 1947,<ref>{{cite journal |url=http://www.winter1947.co.uk |title=Winter 1947 in the British Isles |journal=Weather |volume=62 |issue=3 |pages=61–68 |access-date=22 December 2011 |url-status=live |archive-url=https://web.archive.org/web/20120112022825/http://www.winter1947.co.uk/ |archive-date=12 January 2012 |df=dmy-all |bibcode=2007Wthr...62...61B |last1=Booth |first1=George |year=2007 |doi=10.1002/wea.66 |s2cid=123612433 }}</ref> February 1956, 1962–1963, 1981–1982, and [[Winter of 2009–2010 in Europe|2009–2010]] were abnormally cold.  The UK winter of 1946–1947 started out relatively normal but became one of the snowiest UK winters to date, with nearly continuous snowfall from late January until March.
*In South America, the winter of 1975 was one of the strongest, with record snow occurring at 25°S in cities of low altitude, with the registration of −17&nbsp;°C (1.4&nbsp;°F) in some parts of southern Brazil.
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*In the eastern United States and Canada, the winter of [[2013–14 North American winter|2013–2014]] and the second half of February 2015 were abnormally cold.
[[File:IceAgeEarth.jpg|thumb|184x184px|Period of [[Ice age|Ice Age]] on [[Earth]]]]