Climate of Texas

Texas' weathervaries widely, fromaridin the west tohumidin the east. The huge expanse of Texas encompasses several regions with distinctly different climates: Northern Plains,Trans-PecosRegion,Texas Hill Country,Piney Woods, andSouth Texas. Generally speaking, the part of Texas that lies to the east ofInterstate 35is subtropical, while the portion that lies to the west ofInterstate 35is arid desert.

Texas ranks first in tornado occurrence with an average of 139 per year.Tropical cyclonescan affect the state, either from theGulf of Mexicoor from an overland trajectory originating in the easternPacific Ocean. Those originating from the Gulf of Mexico are more likely to strike the upper Texas coast than elsewhere. Significant floods have occurred across the state throughout history, both from tropical cyclones and from stalledweather fronts.

The Northern Plains' climate is semi-arid and is prone to drought, annually receiving between 16 and 32 inches (410 and 810 mm) of precipitation, and average annual snowfall ranging between 15 and 30 inches (380 and 760 mm), with the greatest snowfall amounts occurring in the Texas panhandle and areas near the border with New Mexico. During the summer, this area of state sees the most clear days.^[2]Winter nights commonly see temperatures fall below the freezing mark, or 32 °F (0 °C). The wettest months of the year are April and May.^[3]Tornadoes, caused by the convergence of westerly and southerly prevailing winds during the latespring, are common, making the region part ofTornado Alley.^[4]Poor land management, drought, and high wind speeds can cause large dust storms, minimized in modern times by improved land-management practices, but most troublesome in the 1930s during theDust Bowlperiod.^[5]Thepanhandleregion, farthest from the Gulf of Mexico, experiences colder winters than the other regions of Texas, where occasional wintertime Arctic blasts can cause temperatures to plunge to well below freezing and bring snowy conditions.^[6]

International areas with comparable climate:Southern China; NorthArgentina;New South Wales,Australia.

The Trans-Pecos region, also known as Big Bend Country, is in the west-central and western parts of the state, consisting of the Chihuahuan Desert and isolated mountain ranges. During fall, winter, and spring, it experiences the most clear days statewide.^[2]It is also the driest receiving an average annual rainfall of only 16 inches (410 mm) or less. Snowfall is rare at lower elevations, although the highest mountain peaks are prone to heavy snowfalls during winter. The arid climate is the main reason fordesertificationof the land, butovergrazingis slowly widening the land area of that desert. In the mountain areas one can seeconiferous forestsin a wetter and more temperate environment. The wettest months in this region occur during the summer.^[3]Winds are strengthened as they are forced to push through canyons and valleys. In the flatter areas these winds are harvested into usable electricity.

International areas with comparable climate:Iraq;Iran;Sahelregion inAfrica

The Texas Hill Country, or central Texas is shaped by its many rivers and hills. The climate issemi-aridwest of Brady through Junction to Rocksprings, but it is sub-humid east and south of that area; both areas have hot summers and mild winters with occasional cold spells. Humidity is high during the warm season, though afternoons especially further northwest can see a wind shift and drier air before Gulf air returns after sunset. The vegetation is bothbroadleaf evergreenanddeciduousin the river valleys, andconiferouswhere there is greater elevation. Dry savannas, open woodlands, and shorter grasses dominate the northwest, while closed woodlands and moist savannas mix with taller grasses in the east and south. In a single year the region can receive up to 48 inches (1,200 mm) of precipitation, and flooding is common near rivers and in low-lying areas, while drier years might receive only 12 inches (300 mm) of precipitation; average annual precipitation ranges from 21 inches (530 mm) in western sections up to 35 inches (890 mm) in southeast. The wettest months of the year are April and May.^[3]

International areas with comparable climate:Israel;Lebanon

ThePiney Woodsis the eastern region of Texas and is within the humid subtropical climate zone. It receives the most rainfall; more than 60 inches (1,500 mm) annually in the far east.^[10]This is due to the gulf currents that carry humid air to the region, where it condenses and precipitates out in the vicinity ofsea breezefronts as well as whenextratropical cyclonesmove by. While coastal sections see the most cloudy days statewide and year-round, northern sections see the most clear days during the summer.^[2]The wettest months of the year are April and May.^[3]The area is prone to severe thunderstorms and tornadoes when the proper conditions exist, generally in the springtime. Hurricanes also strike the region, the most disastrous of which was theGalveston Hurricane of 1900.^[11]More recentlyHurricane Ritapummeled the Golden Triangle of southeast Texas.^[12]The higher humidity of the region amplifies the feeling of heat during the summer. During winter and spring along the immediate coast, temperatures are kept cool by relatively cool gulf waters. Denseadvection fogcan form when warm air moves over the cool shelf waters during February and March, stopping ship traffic for days.

International areas with comparable climate:Taiwan;Philippines; much of the Southern parts ofQueensland,Australia

The region of South Texas includes the semiarid ranch country and the wetterRio Grande Valley. Considered to be the southernmost tip of the AmericanGreat Plainsregion, the inland region has rainfall that is similar to that of the Northern Plains. The coastal areas are nearly warm most of the year due to currents of the Gulf of Mexico. Summers are hot and humid. Rain in the coastal region is more abundant than in the inland region, and subtropical forests line theRio Grande. The wettest months of the year are April and May in western areas, but approaching the Gulf Coast, September becomes the year's wettest month on average. This owes to the threat from tropical weather systems, includinghurricanes, which can bring torrential rains of 5 to 10 inches (130 to 250 mm) in one or two days. The resulting September monthly rainfall maximum prevails, for example, atCorpus Christi,South Padre IslandandBrownsville.^[3]Inland, where it is drier, ranches dominate the landscape, characterized by thick spiny brush and grasslands. The winters in the inland region are variable, but usually mild. Snow is a rare occurrence due to the lack of humidity in winter, and the summers are for the most part hot and dry, but at times can be humid when winds come off the Gulf of Mexico. Tornadoes can occur in this region, but are less frequent than in other parts of the state.

The southernmost part of the state falls just within the tropical climate classification. Occasional years of above average temperatures result in an abundance of tropical flora in the lower Rio Grande Valley, typical of atropical savanna climate.

International areas with comparable climate:India;Vietnam;Thailand

Northern and western sections of the state average snowfall annually due to their colder average readings each winter. For one week in February 1956, a snow storm of historic proportions struck northern Texas. The maximum amount measured was 61 inches (150 cm) atVegawithPlainviewreceiving 24 inches (61 cm) in one day.^[13]El Paso, in Far West Texas, received 22.4 in (57 cm) of snow during a 24-hour period December 13–14, 1987.^[14]For central and southern sections, snowfall is considerably more unusual. In February 1895, a large area of southeastern Texas received over 12 inches (30 cm) of snow, with peak amounts near 30 inches (76 cm) atPort Arthur.^[15]More recently aroundChristmasof 2004, up to 13 inches (33 cm) of snow fell along the middle coast, with the maximum occurring atVictoria.^[16]

One of the worst cold snaps to occur statewide occurred during the last half of December in 1983. Four stations recorded their longest continuous readings at or below 32 °F (0 °C) on record.Lubbocksaw temperatures at or below freezing for 9 days (207 hours). The Dallas-Fort Worth airport measured temperatures at or below freezing for a total of 296 consecutive hours (12 days). Snow which fell on December 14 and 15 across northern Texas stayed on the ground until New Year's Day of 1984.^[17]

February 2021was another record-setting cold snap. AtAustin, the temperature remained at or below freezing for 7 days (168 hours). AtAbilene, the period at or below freezing totaled 10 days (252 hours). The Central Texas region, includingWaco,Bryan, andKilleen, set a new record with 9 days (205 hours) at or below freezing. San Angelo endured 6 days (152 hours) at or below freezing temperatures.^[18]

Thunderstormsare very common in Texas, especially the eastern and northern portion. Texas is part of theTornado Alleysection of the country. The state experiences the mosttornadoesin the Union, an average of 139 a year. These strike most frequently in North Texas and the Panhandle.^[4]Tornadoes in Texas generally occur in April, May, and June.^[19]

Texas's position at the northwestern end of theGulf of Mexicomakes it vulnerable to hurricanes. Some of the most destructive hurricanes in U.S. history have impacted Texas. A hurricane in 1875 killed approximately 400 people inIndianola, followed byanother hurricanein 1886 that destroyed the town, which was at the time the most important port city in the state. This allowedGalvestonto take over as the chief port city, but it was subsequently devastated bya hurricanein 1900 that killed approximately 8,000 people (possibly as many as 12,000), making it the deadliest natural disaster in U.S. history. Other devastating Texan hurricanes include the1915 Galveston Hurricane,Hurricane Carlain 1961,Hurricane Beulahin 1967,Hurricane Aliciain 1983,Hurricane Ritain 2005,Hurricane Ikein 2008 andHurricane Harveyin 2017.^[20]

The climatology of where tropical cyclone strikes are most likely within the state appears to be changing. In the early 1980s, the most favored region during the previous century was the middle coast.^[3]However, that region of the coastline has been rarely impacted since the 1960s, and a recent study indicates that the most vulnerable location to a tropical cyclone strike since 1851 is the upper coast, which has received 56 percent of all tropical cyclone landfalls, of which 66 percent originate from the Gulf of Mexico. This is in contrast with Louisiana and the lower Texan coast, where only 39 percent of the landfalls are from tropical cyclones of Gulf of Mexico origin.^[21]

The most serious threat from tropical cyclones for Texans is from flooding. The worst aspect about tropical cyclones is that the weaker they are, the more efficient they can be at producing heavy rains and catastrophic flooding. Systems with sprawling circulations, such asHurricane Beulah, also tend to make good rainmakers.^[22]Slow moving systems, such asTropical Storm Amelia (1978)andHurricane Harvey (2017)can produce significant rainfall.^[23]Tropical cyclones from the eastern Pacific and Atlantic Basins can impact the Lone Star State.^[24]In general, flooding across Texas is more common during the spring and early autumn months, and it can also be due to nearbystationary frontsinteracting with strong upper levelcyclones.^[25]The most likely location for floods statewide is theBalcones Escarpment, an area of steep elevation gradient in central Texas at the boundary between theEdwards Plateauand the coastal plain.^[26]

The highest temperature ever measured in Texas was 120 °F (48.9 °C), recorded on August 12, 1936 inSeymour, during the1936 North American Heatwave, and again on June 28, 1994 inMonahans. The lowest temperature ever measured in Texas was −23 °F (−30.6 °C), recorded on February 8, 1933 inSeminole.^[27]

TheEl Niño–Southern Oscillation(ENSO) cycle is a huge impact on the weather in Texas. During the El Niño phase, the jet stream is located west-to-east across the southern portion of the United States. Therefore, winters in Texas are colder and receive more snowfall than normal. Texas is less likely to get impacted by hurricanes due to the increased wind shear across the Atlantic. Spring to early summer yields increased rainfall especially where a low pressure system is located over the Four Corners region or northern Mexico which yields monsoon-like climate (which was exacerbated during the 2015 and 2016 spring season where the City of Houston was the hardest hit as if the climate was similar to Mumbai or Kolkata, India with heavy rainfall usually from moisture from the Gulf of Mexico). During the opposite phase, La Niña, the jet stream is much further north, therefore winter is milder and drier than normal. Hurricanes are more likely to impact Texas during La Niña due to decreased wind shear in the Atlantic. Droughts in Texas are much more likely during La Niña. The 2010-11 La Niña is mostly to blame for one of the worst droughts in Texas history.^{[citation needed]}

This section is an excerpt from Climate change in Texas. [edit]

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Theclimate in Texas is changingpartially due toglobal warmingand rising trends ingreenhouse gas emissions.^[30]As of 2016, most area of Texas had already warmed by 1.5 °F (0.83 °C) since the previous century because ofgreenhouse gas emissions by the United Statesand other countries.^[30]Texas is expected to experience a wide range of environmental impacts fromclimate change in the United States, includingrising sea levels, more frequentextreme weatherevents, and increasing pressure onwater resources.^[30]

Texaswas ranked second byGDPacross theU.S. in 2020 and had a fast growing economy.^[32]According to U.S.Energy Information Administration, a large portion of Texas economic growth from 2005 to 2016 came fromconventional energy production.^[33]

Although Texas has a long history of conventional energy production (e.g., petroleum and natural gas), the renewable energyindustry has also been rapidly growing in Texas. Solarindustry jobs have been increasing and wind farms have been built in West Texas in recent years. ^{[34] [35]}Considering the advantages such as sunny weather, flat landand friendly business climate, Texas has high potential to develop more renewable energy in the future. ^[35]In addition, there are emerging local and regional actions to address climate change across Texas. For example, Austin, Houston, Dallas, and San Antonioinitiated Climate Action Plans in recent years. ^{[36] [37] [38] [39]}The government agencies also implemented programs such as Texas Emissions Reduction Planand Innovative Energy Demonstration Programto promote the use of renewable energy and climate educationin Texas.