Editing Fahrenheit (section)

==Usage==

===General===
[[File:Countries that use Fahrenheit.svg|thumb|upright=1.25|left|Countries by usage:{{legend|#339933|Fahrenheit (°F)}}
{{legend|#66cc99|Fahrenheit (°F) and Celsius (°C)}}
{{legend|#cccccc|Celsius (°C)}}]]

The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in Anglophone countries until the 1960s. In the late 1960s and 1970s, the Celsius scale replaced Fahrenheit in almost all of those countries—with the notable exception of the United States.

Fahrenheit is used in the United States, its territories and associated states (all serviced by the U.S. [[National Weather Service]]), as well as the (British) [[Cayman Islands]] and [[Liberia]] for everyday applications. The Fahrenheit scale is in use in U.S. for all temperature measurements including weather forecasts, cooking, and food freezing temperatures, however for scientific research the scale is Celsius and Kelvin.<ref>{{cite web |url=http://www.wmo.int/e-catalog/detail_en.php?PUB_ID=70&SORT=N&q=Aerodrome%20Reports%20and%20Forecasts |title=782 - Aerodrome reports and forecasts: A user's handbook to the codes |access-date=23 September 2009 |work=World Meteorological Organization}}</ref>
[[File:Thermometer CF.svg|thumb|upright]]

===United States===
Early in the 20th century, [[Frederick A. Halsey|Halsey]] and Dale suggested that reasons for resistance to use the centigrade (now Celsius) system in the U.S. included the larger size of each degree Celsius and the lower zero point in the Fahrenheit system; and claimed the Fahrenheit scale is more intuitive than Celsius for describing outdoor temperatures in temperate latitudes, with 100&nbsp;°F being a hot summer day and 0&nbsp;°F a cold winter day.<ref>{{cite book |url=https://books.google.com/books?id=xRMPAAAAYAAJ&pg=PA165 |author1=Halsey, Frederick A. |author-link1=Frederick A. Halsey |author2=Dale, Samuel S. |title=The metric fallacy |publisher=The American Institute of Weights and Measures |edition=2 |year=1919 |pages=165–166, 176–177 |access-date=19 May 2009}}</ref>

===Canada===

Canada [[Metrication in Canada|has passed legislation]] favoring the [[International System of Units]], while also maintaining legal definitions for traditional Canadian imperial units.<ref>{{cite web |url=http://laws-lois.justice.gc.ca/eng/acts/W-6/page-19.html#h-17 |title=Canadian Units of Measurement; Department of Justice, Weights and Measures Act (R.S.C., 1985, c. W-6) |access-date=5 June 2011 |date=17 May 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110513063917/http://laws-lois.justice.gc.ca/eng/acts/W-6/page-19.html#h-17 |archive-date=13 May 2011 |df=dmy }}</ref> Canadian weather reports are conveyed using degrees Celsius with occasional reference to Fahrenheit especially for [[Border blaster#Northern U.S. and Canada|cross-border broadcasts]]. Fahrenheit is still used on virtually all Canadian ovens.<ref>{{cite news |url=https://archive.seattletimes.com/archive/20000604/4024917/did-canada-go-metric-yes---and-no |title=Did Canada go metric? Yes - and no |last=Pearlstein |first=Steven |access-date=5 June 2011 |date=4 June 2000 |work=The Seattle Times}}</ref> Thermometers, both digital and analog, sold in Canada usually employ both the Celsius and Fahrenheit scales.<ref>{{cite web |url=http://www.canadiantire.ca/AST/browse/2/OutdoorLiving/GardenDecor/ClocksThermometers/PRD~0429116P/12-in.%252BThermometer%25252C%252BWhite.jsp?locale=en |title=Example of analog thermometer frequently used in Canada |access-date=6 June 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110706171604/http://www.canadiantire.ca/AST/browse/2/OutdoorLiving/GardenDecor/ClocksThermometers/PRD~0429116P/12-in.%2BThermometer%2C%2BWhite.jsp?locale=en |archive-date=6 July 2011 |df=dmy }}</ref><ref>{{cite web |url=http://www.canadiantire.ca/AST/browse/3/HouseHome/HomeDecor/Thermometers/PRD~0429929P/Deluxe%252BWeather%252BStation.jsp?locale=en |title=Example of digital thermometer frequently used in Canada |access-date=6 June 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110706171434/http://www.canadiantire.ca/AST/browse/3/HouseHome/HomeDecor/Thermometers/PRD~0429929P/Deluxe%2BWeather%2BStation.jsp?locale=en |archive-date=6 July 2011 |df=dmy }}</ref><ref name="Canadian-unit-laws">{{cite web |url=http://laws.justice.gc.ca/eng/W-6/page-2.html |archive-url=https://wayback.archive-it.org/all/20110810220840/http://laws-lois.justice.gc.ca/eng/acts/W-6/page-2.html |url-status=dead |archive-date=10 August 2011 |title=Canadian Weights and Measures Act |author=Department of Justice |publisher=Federal Government of Canada |access-date=17 July 2011 |date=26 February 2009 |df=dmy-all }}</ref>

===European Union===
In the European Union, it is mandatory to use Kelvins or degrees Celsius when quoting temperature for "economic, public health, public safety and administrative" purposes, though degrees Fahrenheit may be used alongside degrees Celsius as a supplementary unit.<ref>{{citation
|url=http://origin-www.legislation.gov.uk/uksi/2009/3046/pdfs/uksi_20093046_en.pdf
|archive-url=https://web.archive.org/web/20170101064857/http://origin-www.legislation.gov.uk/uksi/2009/3046/pdfs/uksi_20093046_en.pdf
|url-status = dead
|archive-date = 2017-01-01
|title = Statutory Instrument 2009/3046 – Weights and Measures – The Units of Measurement Regulations 2009
|quote = "The Secretary of State, being a Minister designated(a) for the purposes of section 2(2) of the European Communities Act 1972(b) in relation to units of measurement to be used for economic, health, safety, or administrative purposes, in exercise of the powers conferred by that subsection, makes the following Regulations:
}}</ref>

===United Kingdom===
Most British people use Celsius.<ref>{{cite web |date=2013-07-24 |title=The media like Fahrenheit but most Brits think in Celsius |url=https://www.opinium.com/the-media-like-fahrenheit-but-most-brits-think-in-celsius/ |access-date=2021-06-21 |website=Opinium |language=en-GB}}</ref> However, the use of Fahrenheit still may appear at times alongside degrees Celsius in the print media with no standard convention for when the measurement is included.

For example, ''[[The Times]]'' has an all-metric daily weather page but includes a Celsius-to-Fahrenheit conversion table.<ref>{{cite news
|newspaper = The Times
|date = 3 July 2013
|page = 55
|title = Weather}}</ref> Some UK tabloids have adopted a tendency of using Fahrenheit for mid to high temperatures.<ref>{{cite news |url=https://www.theguardian.com/media/greenslade/2014/dec/29/newspapers-run-hot-and-cold-over-celsius-and-fahrenheit |title=Newspapers run hot and cold over Celsius and Fahrenheit |date=29 May 2014 |newspaper=[[The Guardian]] |author=Roy Greenslade}}</ref> It has been suggested that the rationale to keep using Fahrenheit was one of emphasis for high temperatures: "−6&nbsp;°C" sounds colder than "21&nbsp;°F", and "94&nbsp;°F" sounds more sensational than "34&nbsp;°C".<ref name="T20060223">{{cite news |title=Measure for measure |date=23 February 2006 |work=The Times }}</ref>