Climate of Houston - wikipedia Climate of Houston Houston Climate chart ( explanation ) J J J O 3.4 63 43 3.2 66 47 3.4 73 53 3.3 80 59 5.1 86 68 5.9 91 73 3.8 94 75 3.8 95 75 4.1 90 70 5.7 82 61 4.3 73 52 3.7 64 45 Average max. and min. temperatures in ° F Precipitation totals in inches Source : NOAA Metric conversion J J J O 86 17 6 81 19 8 87 23 11 84 26 15 129 30 20 151 33 23 96 34 24 96 35 24 105 32 21 145 28 16 110 23 11 95 18 7 Average max. and min. temperatures in ° C Precipitation totals in mm The climate of Houston is classified as humid subtropical. August normally ranks as the warmest month at 84.6 ° F ( 29.2 ° C ) and January the coldest month at 53.1 ° F ( 11.7 ° C ). The normal annual precipitation measures 49.77 inches ( 1,264 mm ). Occasional severe weather of Houston mostly takes the form of flooding. Supercell thunderstorms sometimes bring tornadoes to the area, most commonly during spring. Houston sometimes experiences tropical cyclones during the Atlantic hurricane season, which can bring heavy rain and significant damage to the city. The last hurricane to hit was Hurricane Harvey in 2017. Contents 1 Seasonal observation 1.1 Summer 1.2 Autumn 1.3 Winter 1.4 Spring 2 Precipitation 3 Extreme weather 3.1 Hurricanes and tropical storms 3.2 Flooding 3.3 Tornadoes 3.4 Winter storms 4 El Niño 5 Environmental issues 5.1 Air pollution 5.2 Water pollution 6 Notes 7 References 8 External links Seasonal observation Climate data for Houston ( Intercontinental Airport ), 1981 -- 2010 normals, extremes 1888 -- present Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high ° F ( ° C ) 84 ( 29 ) 91 ( 33 ) 96 ( 36 ) 95 ( 35 ) 99 ( 37 ) 107 ( 42 ) 105 ( 41 ) 109 ( 43 ) 109 ( 43 ) 99 ( 37 ) 89 ( 32 ) 85 ( 29 ) 109 ( 43 ) Mean maximum ° F ( ° C ) 78.4 ( 25.8 ) 80.8 ( 27.1 ) 84.8 ( 29.3 ) 88.9 ( 31.6 ) 93.6 ( 34.2 ) 97.0 ( 36.1 ) 98.4 ( 36.9 ) 100.4 ( 38 ) 96.9 ( 36.1 ) 91.8 ( 33.2 ) 85.0 ( 29.4 ) 80.0 ( 26.7 ) 101.0 ( 38.3 ) Average high ° F ( ° C ) 62.9 ( 17.2 ) 66.3 ( 19.1 ) 73.0 ( 22.8 ) 79.6 ( 26.4 ) 86.3 ( 30.2 ) 91.4 ( 33 ) 93.7 ( 34.3 ) 94.5 ( 34.7 ) 89.7 ( 32.1 ) 82.0 ( 27.8 ) 72.5 ( 22.5 ) 64.3 ( 17.9 ) 79.7 ( 26.5 ) Daily mean ° F ( ° C ) 53.1 ( 11.7 ) 56.4 ( 13.6 ) 62.7 ( 17.1 ) 69.5 ( 20.8 ) 76.9 ( 24.9 ) 82.4 ( 28 ) 84.4 ( 29.1 ) 84.6 ( 29.2 ) 79.8 ( 26.6 ) 71.5 ( 21.9 ) 62.3 ( 16.8 ) 54.4 ( 12.4 ) 69.9 ( 21.1 ) Average low ° F ( ° C ) 43.2 ( 6.2 ) 46.5 ( 8.1 ) 52.5 ( 11.4 ) 59.4 ( 15.2 ) 67.6 ( 19.8 ) 73.5 ( 23.1 ) 75.1 ( 23.9 ) 74.8 ( 23.8 ) 69.8 ( 21 ) 60.9 ( 16.1 ) 52.1 ( 11.2 ) 44.6 ( 7 ) 60.0 ( 15.6 ) Mean minimum ° F ( ° C ) 26.7 ( − 2.9 ) 29.5 ( − 1.4 ) 34.0 ( 1.1 ) 42.0 ( 5.6 ) 53.3 ( 11.8 ) 65.2 ( 18.4 ) 69.4 ( 20.8 ) 68.6 ( 20.3 ) 55.7 ( 13.2 ) 43.4 ( 6.3 ) 34.5 ( 1.4 ) 27.5 ( − 2.5 ) 23.5 ( − 4.7 ) Record low ° F ( ° C ) 5 ( − 15 ) 6 ( − 14 ) 21 ( − 6 ) 31 ( − 1 ) 42 ( 6 ) 52 ( 11 ) 62 ( 17 ) 54 ( 12 ) 45 ( 7 ) 29 ( − 2 ) 19 ( − 7 ) 7 ( − 14 ) 5 ( − 15 ) Average precipitation inches ( mm ) 3.38 ( 85.9 ) 3.20 ( 81.3 ) 3.41 ( 86.6 ) 3.31 ( 84.1 ) 5.09 ( 129.3 ) 5.93 ( 150.6 ) 3.79 ( 96.3 ) 3.76 ( 95.5 ) 4.12 ( 104.6 ) 5.70 ( 144.8 ) 4.34 ( 110.2 ) 3.74 ( 95 ) 49.77 ( 1,264.2 ) Average precipitation days ( ≥ 0.01 in ) 9.6 9.2 8.8 6.8 8.0 10.6 9.1 8.3 8.0 7.9 8.2 9.5 104.0 Average relative humidity ( % ) 74.7 73.4 72.7 73.1 75.0 74.6 74.4 75.1 76.8 75.4 76.0 75.5 74.7 Mean monthly sunshine hours 143.4 155.0 192.5 209.8 249.2 281.3 293.9 270.5 236.5 228.8 168.3 148.7 2,577.9 Percent possible sunshine 44 50 52 54 59 67 68 66 64 64 53 47 58 Source : NOAA ( relative humidity 1969 -- 1990, sun 1961 -- 1990 ) Climate data for Houston ( William P. Hobby Airport ), 1981 -- 2010 normals, extremes 1941 -- present Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high ° F ( ° C ) 85 ( 29 ) 87 ( 31 ) 96 ( 36 ) 94 ( 34 ) 100 ( 38 ) 105 ( 41 ) 104 ( 40 ) 106 ( 41 ) 108 ( 42 ) 96 ( 36 ) 90 ( 32 ) 84 ( 29 ) 108 ( 42 ) Average high ° F ( ° C ) 63.0 ( 17.2 ) 66.0 ( 18.9 ) 72.4 ( 22.4 ) 78.8 ( 26 ) 85.4 ( 29.7 ) 90.1 ( 32.3 ) 92.1 ( 33.4 ) 92.6 ( 33.7 ) 88.4 ( 31.3 ) 81.2 ( 27.3 ) 72.4 ( 22.4 ) 64.5 ( 18.1 ) 78.9 ( 26.1 ) Average low ° F ( ° C ) 45.1 ( 7.3 ) 48.5 ( 9.2 ) 54.3 ( 12.4 ) 60.9 ( 16.1 ) 68.7 ( 20.4 ) 73.9 ( 23.3 ) 75.5 ( 24.2 ) 75.7 ( 24.3 ) 71.7 ( 22.1 ) 63.1 ( 17.3 ) 53.9 ( 12.2 ) 46.7 ( 8.2 ) 61.5 ( 16.4 ) Record low ° F ( ° C ) 10 ( − 12 ) 14 ( − 10 ) 22 ( − 6 ) 36 ( 2 ) 44 ( 7 ) 56 ( 13 ) 64 ( 18 ) 64 ( 18 ) 50 ( 10 ) 33 ( 1 ) 25 ( − 4 ) 9 ( − 13 ) 9 ( − 13 ) Average precipitation inches ( mm ) 3.87 ( 98.3 ) 3.21 ( 81.5 ) 3.20 ( 81.3 ) 3.25 ( 82.6 ) 4.75 ( 120.7 ) 7.10 ( 180.3 ) 4.66 ( 118.4 ) 5.06 ( 128.5 ) 5.21 ( 132.3 ) 5.99 ( 152.1 ) 4.32 ( 109.7 ) 4.03 ( 102.4 ) 54.65 ( 1,388.1 ) Average precipitation days ( ≥ 0.01 in ) 9.2 9.0 8.0 7.1 7.3 9.9 9.1 9.8 9.1 7.6 8.5 9.1 103.7 Source : NOAA ( sun 1961 -- 1990 ) Summer June through August in Houston is very hot and humid, often with scattered afternoon showers and thunderstorms. At George Bush Intercontinental Airport, the normal daily high temperature peaks at 95.0 ° F ( 35.0 ° C ) on 5 -- 12 August, with a normal of 102.4 days per year at or above 90 ° F ( 32 ° C ) and 3.5 days per year at or above 100 ° F ( 38 ° C ). The average relative humidity ranges from over 90 percent in the morning to around 60 percent in the afternoon. Summer temperatures in Houston are very similar to average temperatures seen in tropical climates, such as in the Philippines and Central America. The value of relative humidity results in a heat index higher than the actual temperature. The highest temperature ever recorded at George Bush Intercontinental Airport was 109 ° F ( 43 ° C ) on September 4, 2000 and on August 27, 2011. On June 29, 2013, the temperature at George Bush Intercontinental Airport reached 107 ° F ( 42 ° C ), the highest ever recorded in June. Heat stroke can strike people who stay outdoors for long periods of time during the summer, making hydration essential for outdoor work and recreational activity. The 2014 summer season did not yield 100 + degree weather in response to the monsoon-esque rainfall during late June to August during a period where the Pacific Coast off Central America was heating up which evolved into the 2014 - 16 El Nino event - this cycle one existed between 1971 - 76 during post-El Nino cycles. Heat and humidity in Houston make air conditioning important in day - to - day life. Most indoor workers spend the hottest part of the day in air conditioning. After World War II, air conditioning stimulated the growth of Houston, called the most air - conditioned city in the world in 1950. For construction workers, landscapers, and others who must work outdoors, there is little relief from the summer heat and humidity. Industrial workers, automobile mechanics and others who usually work in non-air conditioned indoor spaces often rely on large electric fans to provide some relief. Autumn Autumn in Houston is warm, with temperatures averaging in the upper 60s to lower 80s ° F ( 20 - 28 ° C ) during the day and in the 50s to lower 60s ° F ( 10 - 17 ° C ) at night. Cool fronts that move through the region during the fall can bring rain. Hurricanes can move into the area from the Gulf of Mexico, bringing heavy rains and high winds. However, most years see little or no significant hurricane activity. Flooding most frequently occurs in October and November. Most of these flood events result from remnants of Eastern Pacific cyclones interacting with upper - level boundaries ; October 2015 was the latest example of such an occurrence, wherein the remnants of Hurricane Patricia brought over 9 inches of rain to the city. The latest hurricane to reach Texas was Hurricane Harvey in August 2017. Winter Winters in Houston are relatively mild and temperate compared to most areas of the United States, though Houston does get much colder than places like South Florida and South Texas. Houston is more prone to extreme variation in the winter months than cities like San Diego, California or Tampa, Florida. The average high in January, the coldest month, is 62.9 ° F ( 17.2 ° C ) and the low 43.2 ° F ( 6.2 ° C ), George Bush Intercontinental Airport sees an average of 9.6 days per year of freezing temperatures. Cold fronts during the winter drop nighttime lows into the 30s but usually above freezing. The coldest weather of the season often includes a period about three weeks with temperatures in the low 30s to mid-40s at night. Hard freezes occur only uncommonly ; however, George Bush Intercontinental Airport has recorded a freeze every winter since it opened in 1969. The coldest temperature ever recorded at George Bush Intercontinental Airport was 7 ° F ( − 14 ° C ) on December 23, 1989. Elsewhere, the temperature in Houston dropped to 5 ° F ( − 15 ° C ) on January 18, 1930. In December, southward - moving cold fronts can bring cold rain, low wind chills, and, rarely, frozen precipitation. Early January is the coldest time of the year, with temperatures moderating slightly by February. Spring Spring comes with a gradual warm up from winter, lasting from March 20 through May. Temperatures are generally not hot yet, averaging from 75 -- 82 ° F ( 23.9 -- 27.8 ° C ) in the day and 56 -- 64 ° F ( 13.3 -- 17.8 ° C ) at night. Spring thunderstorms are common, often with spectacular lightning shows. This rainfall prompts Houston 's 10 - month - long `` growing season '' to begin. April sees the return of many types of insects, including butterflies and mosquitoes, to Houston 's warm climate. Precipitation Rainfall is the most common form of precipitation in Houston. The wettest month is June, with an average of 5.93 inches ( 151 mm ) of rain. Houston normally receives 49.77 inches ( 1,264 mm ) of precipitation on 104.0 days annually. The most precipitation to fall in one year was 83.02 inches ( 2,108.7 mm ) which occurred in 1979. Houston has received less than 20 inches ( 510 mm ) of rain only once : 17.66 inches in 1917. Flash flood warnings are common all year, and due to the flat landscape, heavy rains often threaten life and property in the city. Sea breeze showers which are monsoon - like ( especially during the summer months from a mesoscale convective cycle where the polar jet stream usually forms an omega block ) are common throughout the Texas Gulf Coast area ( from Brownsville to the Florida Peninsula ) which has a similar climate to areas like Mumbai and Kolkata - locals refer to the sea breeze showers as the Gulf Coast Monsoon ( also called the Gulf of Mexico or the Texas Monsoon ), despite Houston being 50 feet above sea level. The sea breeze showers are also a contributor to the North American Monsoon. Sleet, snow, and ice rarely occur during most winters. Hail can accumulate, but only in small quantities. Extreme weather Houston has occasional severe weather, mostly flooding. Hurricanes that have the potential to landfall bring severe damage to the area. Seven major hurricanes have hit the Galveston and Houston areas in the past 100 years. Four have done significant damage to Houston. Hurricanes and tropical storms Because Houston is on the Gulf of Mexico, the city has a small chance of being hit by hurricanes or tropical storms every hurricane season ( June through November ). In 1837 the Racer 's Storm passed just to the south of the town, raising water levels four feet. The Great Hurricane of 1900 destroyed the nearby ( and then much bigger ) city of Galveston, which is situated on a barrier island 50 mi ( 80 km ) southeast of downtown Houston. That hurricane weakened to a tropical storm by the time it reached Houston. The periphery of Hurricane Carla hit the city in 1961, causing major damage to Houston. At the time of landfall, Carla was the most powerful tropical system to hit the Texas coast in over 40 years. In 1983, the city was struck squarely by Hurricane Alicia, causing one billion dollars of damage to the city during a down period in the city 's economy. Tropical Storm Allison dumped up to 37 inches ( 940 mm ) of rain on parts of the city over a five - day period in 2001, and was the most destructive and costly natural disaster in Houston history prior to Hurricane Harvey. Area flooding was catastrophic and widespread. The storm completely overwhelmed the flood control system and caused 22 deaths in Houston and $6.05 billion ( 2006 USD ) in damage. It is the only tropical storm in history to have its name retired. Tropical Storm Erin made landfall in August 2007 with strong rains. A total of 9 inches ( 230 mm ) of rain fell elsewhere than George Bush Intercontinental Airport on August 16, and many roads and neighborhoods were flooded. Metropolitan Transit Authority of Harris County, Texas, halted its light rail and bus services in view of the effects. Four deaths in the city were attributed to the storm. The Houston Fire Department reported 72 rescue operations. Hurricane Ike made landfall near Galveston, Texas in September 2008. Although only a category 2 storm ( out of 5 ), Ike brought moderate rain but high winds for an unusually long duration ( upwards of nine hours ). The roof of Reliant Stadium ( home of the Houston Texans NFL team ) was damaged and windows were blown out of several high - rise buildings in downtown Houston. Storm surge affected areas around Galveston Bay, stripping some coastal islands of homes. Devastated Galveston Island much resembled a war zone. Authorities prohibited non-emergency access to the island for many weeks. Hurricane Ike left ninety percent of people in the Houston Area without power. Never before had the city experienced such widespread or long - term power outage : no air conditioning, no refrigeration, no lights, and no phones. Day - to - day business slowed immensely. Area grocery stores were stripped bare and sold water and ice for cash by flashlight. Trucks from around the country brought in emergency supplies, especially water and ice. Most of the city was without power for a week -- some for 2 to 3 weeks. Hurricane Harvey made landfall in Rockport, Texas on August 25, 2017. By August 30, Houston was flooded due to heavy rainfall from the hurricane. Flooding Flooding is a recurring problem in Houston. It is especially severe in low - lying areas on the far east end of town along the San Jacinto River. The flat wetlands and paved - over coastal prairie around Houston drain slowly and easily flood. The area is drained by a network of bayous ( small, slow - moving rivers, often dredged and enlarged to increase volume ) and man - made drainage ditches, which are usually dry most of the year. In fall, cool fronts bring in rainstorms and flooding is not uncommon. This might flood certain low - lying intersections, but does n't generally affect citizens or the business of the city. However, occasionally very heavy thunderstorms dump so much water on the city that widespread congestion and even property damage in low - lying areas result. Tropical Storm Allison in 2001 was so severe that many parts of town that had never flooded before were flooded seriously. Interstate 10 near downtown, which is below grade, was covered by over 10 ft ( 3.0 m ) of water. Another storm happened in June 2015 ( Tropical Storm Bill ) that had a similar impact on Houston, causing several highways to be closed due to the bayou overflowing ; this event followed flooding from May 24 - 26. Another similar storm in April 2016 resulted in widespread, severe flooding across Houston and surrounding suburbs in an event later known as the `` Tax Day Floods ''. On August 25, 2017, Hurricane Harvey flooded Houston causing severe widespread damage and at least 14 deaths. Tornadoes Unlike Dallas, Houston is not in Tornado Alley, however smaller tornadoes can occur during severe weather. They are most likely to be found along frontal boundaries of an air mass during the spring months. Tornadoes in Houston usually measure a weak F1 on the older Fujita scale and cause light to moderate damage to well - constructed buildings. The strongest recorded tornado in Houston history was an F4 on November 21, 1992, part of a large outbreak of tornadoes in Harris County. Winter storms There are usually a few days of freezing ( < 32 ° F ( 0 ° C ) ) temperatures each year, though the average low in January, the coldest month, is still only 43 ° F ( 6 ° C ) or 24 ° F ( − 4 ° C ). Snow falls infrequently in the Magnolia City. When it does occur, it almost invariably melts immediately on the ground with light accumulation on roofs and raised surfaces. Since 1895, it has snowed 38 times in Houston at an average of about once every 10 years, though some decades have several instances of recorded snowfall while others have only one each ( e.g., the 1930s and 1950s ). The last recorded snowfall in Houston was on January 16, 2018. There were more incidences of snow in the 1980s on average than any other decade recorded, but the 2000s also witnessed more frequent and record - breaking snows. February 14 -- February 15, 1895 : 20 inches ( 51 cm ) of snow, its largest snowfall from one storm on record. February 12, 1960 : 4.4 inches ( 11 cm ) of snow. January 11, 1973 : 2.0 inches ( 5.1 cm ) of snow. December 22, 1989 : 1.7 inches ( 4.3 cm ) of snow with a record low of 7 ° F ( − 14 ° C ) on December 23. December 10, 2008 : Tied the earliest snowfall record. December 4, 2009 : Broke the earliest snowfall record. December 7, 2017 : 0.7 inches ( 2 cm ) of snow. The December 21 -- 24, 2004 North American winter storm brought a white Christmas to the region. The average has the lowest recorded temperature for that month, 24 ° F ( − 4 ° C ). The 2004 Christmas Eve snowstorm brought a never - before - seen white Christmas to the region. Average annual snowfall is very, very little above zero, being less than the measurable amount of 0.1 inches ( 2.5 mm ). In descending order of frequency, the most snow has fallen in January, followed by February, December, and finally a single occurrence on March 10, 1932, which was also the lowest recorded temperature for that month, 22 ° F ( − 6 ° C ). December 24 snowstorm, shown on satellite Occurrences of freezing rain, also known as ice storms, are slightly less rare than snow in Houston. Some of the most recent ice storms occurred in 1997, 2007, February 4, 2011, and January 16, 2018. An overnight event occurred from January 23, 2014 to January 24, another significant icing occurred a few days later on January 28, and a third event took place on March 4. These storms can be very disruptive since road crews are not equipped to handle such rare events over the city 's expansive size. When ice occurs, roads and schools are usually closed. The city 's Office of Emergency Management encourages driver 's to `` avoid driving unless absolutely necessary... if roadways are at risk of icing. '' Typically, such ice storms affect mainly the northern / western areas of the metro, while the southern / eastern areas are left with just cold rain. The ice storm that occurred on January 16, 2018 started as cold rain for several hours before changing to wintry mix and then eventually sleet and snow, Temps started in the low - mid 30 's and quickly dropped to the 20 's in the afternoon and then the teens by the evening / overnight hours which caused all the rain to turn to ice and thickness up to 1 ' on some roads, bridges and overpasses making it one of the worst winter storms in history. El Nino During El Niño, Houston winters are cooler and wetter than normal due to a stronger southern jet stream. Increased clouds during El Nino winters are what keep the temperatures from warming up. La Niña is where the jet stream is further north resulting in a warmer and drier winter. The chance of damage from tropical storms and hurricanes also goes up during La Niña events due to decreased Atlantic wind shear. Post-El Niño weather during the spring usually result in increased rainfall, as demonstrated with the Memorial Day 2015 and Tax Day / Memorial Day / early June 2016 flood events where the Houston Metro area ( and the rest of the state ) experienced a climate similar to the South Asian summer monsoon ( in this case with the state of Texas where a stalled low pressure system ( usually from an upper level low from the northeast Pacific Ocean which migrates east where the northern polar jet stream form the usual omega blocks ) originates over the Four Corners region or the Sierra Madre Occidental / Sierra Madre Oriental mountain ranges in northern Mexico ). Environmental Issues Houston has had a troubled past with pollution of many types. This is due to the fact that Houston has been the home for the oil and gas industry since its inception in the early 1900s when there was little environmental regulation. Harris County, where the bulk of the city has been historically located, is home to 15 Environmental Protection Agency Superfund sites, more than any other area in Texas. The list contains numerous companies, streets and waterways that have been considered hazardous to humans in various ways. Air pollution Houston is well known for its oil and petrochemical industries, which are leading contributors to the city 's economy. The industries located along the ship channel, coupled with a growing population, have caused a considerable increase in air pollution for the city each year. Houston has excessive ozone levels and is ranked among the most ozone - polluted cities in the United States. Ground - level ozone, or smog, is Houston 's predominant air pollution problem. In 2011, Houston was ranked as the 17th most polluted city in the US, according to the American Lung Association. A 2007 assessment found the following twelve air pollutants to be definite risks to health in Houston : ozone - respiratory and cardiovascular effects particulates less than 2.5 μm in diameter ( PM ) - respiratory and cardiopulmonary effects diesel particulate matter ( DPM ) - cancer 1, 3 - butadiene - cancer and reproductive effects hexavalent chromium - cancer benzene - cancer ethylene dibromide - cancer acrylonitrile - cancer formaldehyde - cancer and respiratory effects acrolein - respiratory effects chlorine - respiratory effects hexamethylene diisocyanate - pulmonary and respiratory effects The State of Texas concluded that, since 2000, the Manchester neighborhood in eastern Houston had the highest annual averages of 1, 3 - Butadiene of any area in Texas. Houston 's air quality has often been compared to Los Angeles and Beijing. Houston has introduced many programs since the 2000 federal order to reduce air pollution in the city. The most notable project was the METRORail light rail system constructed in 2004. The light rail system was designed to encourage Houstonians to utilize public transportation instead of their automobiles. To date it has had limited success and been a source of controversy and cost overruns. Water pollution Houston has also seen recent improvements to the city 's waterways. The banks of Buffalo Bayou have been cleaned of garbage and have been turned into jogging trails and parks. Since the mid-1990s, Houston has seen a great increase in wildlife along the bayou due to many successful cleaning attempts. The Port of Houston has not seen any major cleaning attempts. Notes Jump up ^ Mean monthly maxima and minima ( i.e. the highest and lowest temperature readings during an entire month or year ) calculated based on data at said location from 1981 to 2010. Jump up ^ Official records for Houston were kept at the Weather Bureau in downtown from July 1888 to May 1969, and at Intercontinental since June 1969. References ^ Jump up to : NOAA 1981 - 2010 normals Jump up ^ ThreadEx ^ Jump up to : `` NowData - NOAA Online Weather Data ''. National Oceanic and Atmospheric Administration. Retrieved 2016 - 04 - 13. Jump up ^ `` Station Name : TX HOUSTON INTERCONT AP ''. National Oceanic & Atmospheric Administration. Retrieved 2014 - 03 - 27. Jump up ^ `` WMO Climate Normals for HOUSTON / INTERCONTINENTAL, TX 1961 -- 1990 ''. National Oceanic and Atmospheric Administration. Retrieved 2014 - 03 - 10. Jump up ^ Department of Meteorology at the University of Utah. National Relative Humidity. Archived December 9, 2006, at the Wayback Machine. Retrieved on 2007 - 03 - 10. Jump up ^ `` Archived copy ''. Archived from the original on 2006 - 12 - 09. Retrieved 2006 - 12 - 14. Jump up ^ Your Florida Backyard. The Heat Index. Retrieved on 2008 - 03 - 20. Jump up ^ Weather Underground. History for Houston Intercontinental, Texas on Monday, September 4, 2000. Retrieved on 2007 - 03 - 10. Jump up ^ http://blog.chron.com/sciguy/2011/08/heat-watch-houston-ties-all-time-record-high/ Jump up ^ http://www.srh.noaa.gov/hgx/?n=climate_iah Jump up ^ Texas Medical Center News. Temperature Rising ? Could be Heat Stroke. Retrieved on 2007 - 03 - 11. Jump up ^ The Old House Web How Air Conditioning Changed America. Retrieved on 2007 - 03 - 11. Jump up ^ Houston Geological Auxiliary. A Short History. Retrieved on 2014 - 02 - 04. Jump up ^ Greater Houston Partnership. Information / Data -- All About Houston. Retrieved on 2006 - 01 - 09. Jump up ^ Weather Research Center. Significant Houston Area Floods. Jump up ^ Reuters. ( 1 ) Retrieved on 2006 - 01 - 09. Jump up ^ National Weather Service Jump up ^ TSHA Handbook of Texas. Blue Norther. Retrieved on 2007 - 03 - 11. Jump up ^ Severe Thunderstorms. National Weather Service Forecast Office Houston / Galveston, Texas, Retrieved on March 11, 2007 Jump up ^ Houston 's Annual Top 10 List. National Weather Service, Houston / Galveston, Texas. January 30, 2006. Last accessed January 3, 2006. Jump up ^ http://www.srh.noaa.gov/lch/research/txearly19hur.php Early Texas Hurricane History, 1800 - 1850, Retrieved on March 10, 2007 Jump up ^ Remembering the Great Hurricane, September 8, 1900. Galveston County Daily News, Retrieved on March 11, 2007 Jump up ^ Hurricane Carla, September 9 - 12, 1961. National Weather Service, Retrieved on March 11, 2007 Jump up ^ Tropical Storm Allison Floods June 5 - 9, 2001. National Weather Service Forecast Office Houston / Galveston, Texas, Retrieved on March 11, 2007 Jump up ^ http://www.chron.com/disp/story.mpl/front/6000312.html Jump up ^ `` Hurricane Harvey makes landfall in Texas ''. The Guardian. Retrieved 26 August 2017. Jump up ^ `` Storm Summary Number 17 for Tropical Storm Harvey ''. National Centers for Environmental Prediction. Jump up ^ `` NASA shows how Harvey saturated Texas ''. Jump up ^ `` KTRK coverage of the aftermath of the November 1992 tornado outbreak ''. 22 November 1992. Berger, Eric ( 29 May 2008 ). `` Houston 's top five weather events since 1992 : No. 3 ''. Houston Chronicle. Retrieved 23 November 2015. Jump up ^ http://www.wxresearch.com/snowhou.htm Jump up ^ `` Snow in Houston : It Happens More Than You Think ''. KTRK - TV. December 8, 2017. Jump up ^ `` Remember When : Houston 's huge snow storm of 1960 ''. KTRK - TV. December 8, 2017. Jump up ^ `` One Hundred Years of Southeast Texas Weather ( 1900 - 2000 ) ''. National Weather Service. National Oceanic and Atmospheric Administration. Jump up ^ Berger, Eric ; Latson, Jennifer ; Leahy, Jennifer ( December 10, 2008 ). `` Snow surprises Houston - area residents ''. Houston Chronicle. Jump up ^ George, Mike ( December 4, 2009 ). `` Houston Snow Sets All Kinds of Records ''. KBTX - TV. Jump up ^ http://www.wxresearch.com/snowhou.htm/ Jump up ^ http://preview.weather.com/weather/wxclimatology/monthly/graph/USTX0617?role =/ Jump up ^ `` Houston paralyzed by ice storm - Disaster News Network ''. www.disasternews.net. Retrieved 2015 - 11 - 23. Jump up ^ `` Drivers urged to stay home during Houston 's icy mess ''. Houston Chronicle. Retrieved 2015 - 11 - 23. Jump up ^ `` Cold and icy, Texas and Louisiana deal with winter - CNN.com ''. CNN. Retrieved 2015 - 11 - 23. Jump up ^ Mayor 's Office Office of Emergency Management houstonoem.org ( 2015 ). Disaster Preparedness Guide. http://www.houstonoem.org/external/content/document/4027/2168878/1/COH-DPG2015-ENG-WEB.pdf : Office of Emergency Management. p. 20. Jump up ^ http://w2.weather.gov/climate/xmacis.php?wfo=hgx Jump up ^ The EPA 's Superfund list for Texas ^ Jump up to : `` Summary of the Issues Archived June 9, 2008, at the Wayback Machine. '', Citizens League for Environmental Action Now, 2004 - 08 - 01. Retrieved on 2006 - 02 - 17. Jump up ^ `` State of the Air 2005, National and Regional Analysis Archived May 19, 2008, at the Wayback Machine. '', American Lung Association, 2005 - 03 - 25. Retrieved on 2006 - 02 - 17. Jump up ^ http://www.citymayors.com/environment/polluted_uscities.html Jump up ^ Sexton K, Linder SH, Marko D, Bethel H, Lupo PJ ( 2007 ). `` Comparative Assessment of Air Pollution -- Related Health Risks in Houston ''. Environ Health Perspect. 115 ( 10 ) : 1388 -- 93. doi : 10.1289 / ehp. 10043. PMC 2022677. PMID 17938725. Jump up ^ `` State Results : Pollution Glance. '' Houston Chronicle. Jump up ^ Texas Monthly Guide to Houston Edition 1996 ISBN 0 - 87719 - 272 - 3 Pg. 9 - 10. External links Weather Averages for Houston Comparison with month average and actual temps City of Houston Nickname : Space City Topics Architecture Climate Culture Demographics Economy Geography History Timeline Media Newspapers Transportation Sister cities Attractions Art Car Parade Bayou Place Comicpalooza Discovery Green Downtown Aquarium Free Press Summer Fest The Galleria Hermann Park Houston Livestock Show and Rodeo Houston Zoo Kemah Boardwalk Lee and Joe Jamail Skatepark Memorial Park Museum District The Orange Show San Jacinto Battleground State Historic Site Space Center Houston Splashtown Texas Medical Center Theater District Waterwall Park Business Districts Downtown Uptown Texas Medical Center Greenway Plaza Energy Corridor Westchase Memorial City Greenspoint See also : List of companies in Houston Communities Acres Homes Addicks Alief Almeda Bordersville Boulevard Oaks Braeburn Braeswood Place Brays Oaks Blue Ridge Chinatown Clear Lake City Denver Harbor East Downtown East End East Houston Fairbanks Forum Park Genoa Glenbrook Valley Gulfton Harrisburg Hiram Clarke Houston Heights Independence Heights Inwood Forest Kingwood Link Valley Lower Westheimer Magnolia Park Mahatma Gandhi District Maplewood Memorial Meyerland Midtown Montrose District Museum District Neartown Near Northwest North Shore Northside Oak Forest River Oaks Riverside Terrace Southwest Management District South Park Spring Branch Sunnyside Upper Kirby Historic wards First Ward Second Ward Third Ward Fourth Ward Fifth Ward Sixth Ward Education State universities University of Houston University of Houston -- Clear Lake University of Houston -- Downtown Texas Southern University Private universities Houston Baptist University Rice University University of St. Thomas Community colleges Houston Community College Lone Star College San Jacinto College Lee College K - 12 school districts Houston ISD Aldine ISD Alief ISD Spring Branch ISD Clear Creek ISD Cy - Fair ISD Fort Bend ISD Galena Park ISD Humble ISD Katy ISD Pasadena ISD Spring ISD Huffman ISD New Caney ISD See : List of colleges and universities in Houston Government City Council Fire Mayors Police Politics Neighborhoods Afton Oaks Brentwood Briargrove Park Briarhills Broadacres City Park Clinton Park Cloverland Corinthian Pointe Cottage Grove Crestwood / Glen Cove Eastwood Garden Oaks Glenshire Highland Village Houston Gardens Idylwood Kashmere Gardens Knollwood Village Lakes of Parkway Larchmont Magnolia Grove Montrose Morningside Place Near North Side Nottingham Forest Old Braeswood Parkway Villages Pecan Park Port Houston Rice Military Richmond Strip Robindell Royal Oaks Country Club Sagemont Scenic Woods Settegast Shadyside Sharpstown Shenandoah Somerset Green Southampton Southbelt / Ellington Southcrest Southgate Stablewood St. George Place ( Lamar Terrace ) Sunset Terrace / Montclair Tanglewood University Oaks Village at Glen Iris Walnut Bend Westbury West End West Oaks Westwood ( subdivision ) Westmoreland Willow Meadows Willowbend Windsor Village Woodland Heights Sports Houston Astros Houston Dash Houston Dynamo Houston Rockets Houston SaberCats Houston Texans Scrap Yard Dawgs Harris County Houston -- The Woodlands -- Sugar Land Metro Texas United States Retrieved from `` https://en.wikipedia.org/w/index.php?title=Climate_of_Houston&oldid=828844204 '' Categories : Houston Climate of Texas Climate by city in the United States Hidden categories : Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from January 2008 Talk Contents About Wikipedia Add links This page was last edited on 5 March 2018, at 02 : 33. 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Question: when does it start warming up in houston
Answer: March 20