San Antonio

===Climate===
{{climate chart
| San Antonio
| 37.6 | 61.1 | 1.76
| 42.4 | 67.1 | 1.79
| 49.9 | 74.3 | 2.31
| 56.9 | 80.4 | 2.10
| 65.5 | 86.0 | 4.01
| 71.6 | 91.4 | 4.14
| 74.0 | 94.6 | 2.74
| 73.6 | 94.7 | 2.09
| 68.8 | 90.0 | 3.03
| 59.4 | 82.0 | 4.11
| 48.6 | 71.4 | 2.28
| 40.8 | 64.0 | 1.91
| units = imperial
| float = right
| clear = both
| source = NOAA}}
San Antonio has a transitional [[humid subtropical climate]] ([[Köppen climate classification|Köppen]]: ''Cfa'') that borders a [[hot semi-arid climate]] ([[Köppen climate classification]]: ''BSh'') towards the west of the city<ref>{{cite web|url=https://www.theweatherprediction.com/weatherpapers/041/index.html |title=The Roles of Geography and Climate in Forecasting Weather in South Texas |publisher=Theweatherprediction.com |access-date=March 6, 2013}}</ref><ref>[https://www.srh.noaa.gov/images/ewx/sat/satclisum.pdf] {{Webarchive|url=https://web.archive.org/web/20111212140241/https://www.srh.noaa.gov/images/ewx/sat/satclisum.pdf|date=December 12, 2011}}</ref><ref>{{cite web|url=https://commons.wikimedia.org/wiki/File:Climatemapusa2.PNG |title=Climatemapusa2.PNG file- Wikimedia Commons |date=February 11, 2008 |publisher=Commons.wikimedia.org |access-date=March 6, 2013}}</ref> featuring very hot, long, and humid summers and mild to cool winters. The area is subject to descending northern cold fronts in the winter with cool to cold nights, and is warm and rainy in the spring and fall. San Antonio falls in [[USDA]] [[hardiness zones]] 8b (15&nbsp;°F to 20&nbsp;°F) and 9a (20&nbsp;°F to 25&nbsp;°F).<ref>{{cite web |url=https://www.plantmaps.com/hardiness-zones-for-san-antonio-texas |title=San Antonio Texas USDA Plant Hardiness Zone Map |publisher=plantmaps.com plantmaps|access-date=October 7, 2019}}</ref>

San Antonio receives about a dozen subfreezing nights each year, typically seeing snow, sleet, or freezing rain about once every two or three winters, but accumulation and snow itself are very rare. Winters may pass without any frozen precipitation at all, and up to a decade has passed between snowfalls. According to the [[National Weather Service]], there have been 32 instances of snowfall (a trace or more) in the city in the past 122 years, about once every four years. Prior to 2021 snow was most recently seen on December 7, 2017, when {{convert|1.9|in|cm|1}} of snow coated the city.<ref>{{cite web|url=https://www.weather.gov/ewx/wxevent-20171207|title=December 2017 Snow Event|work=www.weather.gov|access-date=April 27, 2019}}</ref> On January 13, 1985, San Antonio received a record snowfall of {{convert|16|in|cm}}.<ref>{{cite news |title= San Antonio Suffers Worst Snowfall |agency=United Press International |date= January 12, 1985 |url= https://news.google.com/newspapers?id=GAwhAAAAIBAJ&pg=5513,2984374&dq=austin+snowstorm&hl=en |location=Schenectady, New York}}</ref><ref>"Record Snow Buries San Antonio". ''Associated Press''. The Philadelphia Inquirer. p. A3.</ref> During the [[February 13–17, 2021, North American winter storm]], San Antonio was blanketed with 4–6 inches (10–15&nbsp;cm) of snow. The cold air which accompanied this storm caused [[2021 Texas power crisis|massive rolling blackouts]] throughout the city until the 18th. The [[February 15–20, 2021, North American winter storm]] dropped another 1–2 inches (2.5–5&nbsp;cm) on the city on the 16th.

San Antonio and [[New Braunfels]], {{convert|40|mi|km|0}} to the northeast, are some of the most flood-prone regions in North America.<ref>{{Cite web|url=https://www.floodsafety.com/texas/regional-info/san-antonio-flooding/|title=San Antonio Flooding – Updated November, 2020|access-date=September 21, 2020|archive-date=September 27, 2020|archive-url=https://web.archive.org/web/20200927174012/http://www.floodsafety.com/texas/regional-info/san-antonio-flooding/|url-status=dead}}</ref> The [[October 1998 Central Texas floods]] were among the costliest floods in United States history, resulting in $750&nbsp;million in damage and 32 deaths. In 2002, from June 30 to July 7, {{convert|35|in|abbr=on}} of rain fell in the San Antonio area, resulting in widespread flooding and 12 fatalities.<ref>{{cite news|url=http://www.floodsafety.com/texas/documentaries/j2002/index.htm|title=South Central Texas June 30 – July 7, 2002|publisher=Flood Safety Education Project}}</ref>

Tornadoes within the city limits have been reported as recently as February 2017, although they seldom occur.<ref>{{cite web|url=http://www.mysanantonio.com/news/local_news/article/Tornado-touched-down-during-overnight-storms-2209975.php|title=Tornado rakes S.A. neighborhood|website=Mysanantonio.com|date=October 10, 2011|access-date=July 12, 2018}}</ref> An F2 tornado lands within {{convert|50|mi|abbr=on}} of the city on average once every five years. San Antonio has experienced two F4 tornadoes, [[Tornado outbreak sequence of April 28 – May 2, 1953|one in 1953]] and another in 1973. The 1953 tornado resulted in two deaths and 15 injuries.<ref>{{Cite web|url=https://www.homefacts.com/tornadoes/Texas/Bexar-County/San-Antonio.html|title=San Antonio, Bexar County, TX Tornadoes|website=www.homefacts.com}}</ref>

In San Antonio, July and August tie for the average warmest months, with an average high of {{convert|95|°F|0}}. The highest temperature ever recorded was {{convert|111|F|C|0}} on September 5, 2000.<ref name="climate-summary" /> The average coolest month is January. The lowest recorded temperature ever was {{convert|0|F|C|0}} on January 31, 1949.<ref name="climate-summary" /> May, June, and October have quite a bit of precipitation. Since recordkeeping began in 1871, the average annual precipitation has been {{convert|29.03|in|mm|0}}, with a maximum of {{convert|52.28|in|mm|0}} and a minimum of {{convert|10.11|in|mm|1}} in one year.<ref>{{cite web|url=http://www.srh.noaa.gov/images/ewx/sat/satmonrain.pdf|title=MONTHLY/ANNUAL/AVERAGE PRECIPITATION SAN ANTONIO, TX (1871–2010)|publisher=[[National Weather Service]]|access-date=June 3, 2012}}</ref>
{{San Antonio weatherbox}}
{|style="width:100%;text-align:center;line-height:1.2em;margin-left:auto;margin-right:auto" class="wikitable mw-collapsible mw-collapsed"
|-
!Colspan=14|Climate data for San Antonio
|-
!Month
!Jan
!Feb
!Mar
!Apr
!May
!Jun
!Jul
!Aug
!Sep
!Oct
!Nov
!Dec
!style="border-left-width:medium"|Year
|-
!Mean daily daylight hours
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#FFFF33;color:#000000;"|12.0
|style="background:#FFFF44;color:#000000;"|13.0
|style="background:#FFFF55;color:#000000;"|14.0
|style="background:#FFFF55;color:#000000;"|14.0
|style="background:#FFFF55;color:#000000;"|14.0
|style="background:#FFFF44;color:#000000;"|13.0
|style="background:#FFFF33;color:#000000;"|12.0
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#F7F722;color:#000000;"|11.0
|style="background:#F0F011;color:#000000;"|10.0
|style="background:#FFFF35;color:#000000;border-left-width:medium"|12.2
|-
!Average [[Ultraviolet index]]
|style="background:#f7e400;color:#000000;"|4
|style="background:#f85900;color:#000000;"|6
|style="background:#d8001d;color:#000000;"|8
|style="background:#d8001d;color:#000000;"|10
|style="background:#6b49c8;color:#000000;"|11
|style="background:#6b49c8;color:#000000;"|11
|style="background:#6b49c8;color:#000000;"|11
|style="background:#6b49c8;color:#000000;"|11
|style="background:#d8001d;color:#000000;"|10
|style="background:#f85900;color:#000000;"|7
|style="background:#f7e400;color:#000000;"|5
|style="background:#f7e400;color:#000000;"|4
|style="background:#d8001d;color:#000000;border-left-width:medium"|8.2
|-
!Colspan=14 style="background:#f8f9fa;font-weight:normal;font-size:95%;"|Source: Weather Atlas<ref name="Weather Atlas" />
|}
{{Graph:Weather monthly history
| table=Ncei.noaa.gov/weather/San Antonio.tab
| title=San Antonio monthly weather statistics
}}