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Austin, Travis County and Williamson County have been the site of human habitation since at least 9200 BC. The area's earliest known inhabitants lived during the late Pleistocene (Ice Age) and are linked to the Clovis culture around 9200 BC (over 11,200 years ago), based on evidence found throughout the area and documented at the much-studied Gault Site, midway between Georgetown and Fort Cavazos.
The highest temperature ever measured in Texas was 120 °F (48.9 °C), recorded on August 12, 1936 in Seymour, during the 1936 North American Heatwave, and again on June 28, 1994 in Monahans. The lowest temperature ever measured in Texas was −23 °F (−30.6 °C), recorded on February 8, 1933 in Seminole. [27] Climate data for Texas.
On average, even the coldest month of January is generally mild, with an average high of 57.7 °F (14.3 °C) and low of 37.9 °F (3.3 °C). Based on 1991-2020 climate data, the average coldest temperature for an entire year is about 19.1 °F (−7.2 °C), placing Dallas in USDA zone 8b. The all-time recorded low is −3 °F (−19 °C) on ...
The highest recorded temperature of 104 °F (40 °C) was on June 25, 2012. [37] The record low was −33 °F (−36 °C) on January 17, 1930. The coldest high temperature, −12 °F (−24 °C), was on February 4, 1989. The warmest overnight low was on July 20, 1998, with a temperature of 82 °F (28 °C) [38]
The temperature varies little statewide in the summer; however, in winter, the region near Mississippi Sound is significantly warmer than the inland portion of the state. The recorded temperature in Mississippi has ranged from −19 °F (−28 °C), in 1966, at Corinth in the northeast, to 115 °F (46 °C), in 1930, at Holly Springs in the north.
[25] [26] On 28 July 2010, Oymyakon recorded a record high temperature of 34.6 °C (94.3 °F), [27] yielding a temperature range of 105.8 °C (190.4 °F). Verkhoyansk , Yakutsk , Delyankir , Tegyulte , and Fort Vermilion , Canada are the only other known places in the world that have a temperature amplitude higher than 100 °C (180 °F).
The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.
The all-time record low temperature is −17 °F (−27 °C), which occurred on January 21, 1916; the lowest temperature recorded at the airport is −16 °F (−27 °C), which occurred on four occasions, most recently on February 7, 1989. [38]