Editing Yuma, Arizona (section)

===Climate===
Yuma is noted for its weather extremes.  Of any populated place in the contiguous United States, Yuma is the driest, the sunniest, and the least humid, has the lowest frequency of precipitation, and has the highest number of sunny days per year—175—with a daily maximum temperature of {{convert|90|°F|0}} or higher.<ref>{{cite web | title = Mean Number of Days Maximum Temperature 90 Deg. F or Higher | work = Comparative Climatic Data for the United States Through 2012 | publisher = National Oceanic and Atmospheric Administration: U.S. Dept. often Commerce | year = 2013 | url = http://www1.ncdc.noaa.gov/pub/data/ccd-data/mxge9012.txt | url-status = dead | archive-url = https://web.archive.org/web/20131106025131/http://www1.ncdc.noaa.gov/pub/data/ccd-data/mxge9012.txt | archive-date = November 6, 2013 }}</ref><ref name="Extremes">{{cite web | title = Extremes in U.S. Climate | publisher = National Climate Data Center | url = http://www.ncdc.noaa.gov/extremes/extreme-us-climates.php#SUN-CLOUD }}</ref>

Yuma features a [[hot desert climate]] ([[Köppen climate classification]] ''BWh''), with extremely hot summers and warm winters. Atmospheric humidity is usually very low, except during what are called "[[Gulf surge]]s", when a maritime tropical air mass from the [[Gulf of California]] is drawn northward, usually in connection with the [[North American Monsoon|summer monsoon]] or the passage of a tropical storm to the south.<ref>{{Cite news|url=https://www.latimes.com/california/story/2019-08-21/hurricanes-here-the-cordonazo-that-lashed-los-angeles|title=Could a hurricane lash Los Angeles? 80 years ago, this deadly storm came close|last=Duginski|first=Paul|date=August 22, 2019|newspaper=[[Los Angeles Times]]|language=en-US|access-date=August 28, 2019}}</ref>

The sun is said to shine during about 90% of the daylight hours, making Yuma one of the sunniest places in the world.<ref>{{cite web|url=http://www.metoffice.gov.uk/media/pdf/s/m/factsheet09.pdf|title=Fact sheet No. 9 – Weather extremes|url-status=dead|archive-url=https://web.archive.org/web/20160604050938/http://www.metoffice.gov.uk/media/pdf/s/m/factsheet09.pdf|archive-date=June 4, 2016|access-date=May 16, 2016}}</ref> The city receives the most recorded mean sunshine of anywhere on Earth,<ref name="Extremes"/><ref>{{cite web | last = Osborn | first = Liz | title = Sunniest Places and Countries in the World | publisher = Current Results Nexus | url = http://www.currentresults.com/Weather-Extremes/sunniest-places-countries-world.php }}</ref> although the equipment used by the United States tends to provide higher sunshine estimates than the traditional [[Campbell–Stokes recorder]].<ref>{{Cite journal| doi = 10.1007/s00704-014-1125-z| issn = 1434-4483| volume = 119| issue = 3| pages = 401–406| last = Matuszko| first = Dorota| title = A comparison of sunshine duration records from the Campbell-Stokes sunshine recorder and CSD3 sunshine duration sensor| journal = Theoretical and Applied Climatology| date = February 1, 2015| bibcode = 2015ThApC.119..401M| doi-access = free}}</ref>

On average, Yuma receives {{convert|3.36|in|mm}} of rain annually. Even in the wettest year of 2005, only {{convert|7.39|in|abbr=on}} fell. The driest year at Yuma Airport was 2007, with only {{convert|0.15|in|abbr=on}} recorded. On average, the wettest months of the year are during the monsoon months of August and September, and December, when moisture from winter storms arrives from the Pacific Ocean. June is the driest month, with drought virtually absolute.

In 1995, Yuma recorded its all-time high temperature of {{convert|124|°F|0}}.<ref>{{cite web|url=http://www.intellicast.com/Local/History.aspx?location=USAZ0275|title=Intellicast – Yuma Historic Weather Averages in Arizona (85365)|access-date=January 15, 2017}}</ref> The lowest recorded temperature was in the Yuma-Mesa area in January 2007. The temperature fell to {{convert|-6|C|abbr=on||order=flip}} for approximately two hours, harming many crops grown in and around Yuma. [[Citrus]] suffered the most, particularly the lemon crop. According to an Arizona Department of Agriculture report in February 2007, there was a 75% to 95% loss of crop and trees. On average (according to the 1991-2020 climate period), the temperature reaches freezing point in one year in fifteen, and there are 117 days per year during which the temperature reaches or exceeds {{convert|100|°F|0}}, usually from April through October.<ref name="auto">{{Cite web|url=https://www.weather.gov/wrh/climate?wfo=psr|title = Climate}}</ref> During July and August, the temperature fails to reach {{cvt|100|F|C}} on only one and two days on average, respectively.<ref name="auto"/>

In 1997, the desert city sustained a full [[tropical storm]] after [[Hurricane Nora (1997)|Hurricane Nora]] made [[landfall (meteorology)|landfall]] at the mouth of the Colorado River and quickly moved due north along it. This rare event cut power to 12,000 customers in Yuma, and dropped {{convert|3.59|in|mm}} of rain at [[Marine Corps Air Station Yuma]]. The last time a hurricane had hit near Yuma was in mid-August 1977, when similar rainfalls were recorded.

{{Yuma, Arizona weatherbox}}

Snow in Yuma has only been recorded on December 12, 1932, when a light coating of snow covered the city for the first and only time in its history. A few flakes fell in January 1937 and December 1967, mixed with rain.<ref>{{Cite web | url=https://books.google.com/books?id=GydMDoHandAC&q=snow+Yuma+december+1932&pg=RA4-PA65 | title=Climatological Data: Arizona section| year=1929}}</ref>