![]() Although the average freeze-free period runs from March to November, the actual growing seasons are more closely tied to the rainier periods of spring and fall, with dormancy dominating summer and winter. The precipitation is also unevenly distributed throughout the year, typically favoring a bimodal distribution of wet spring/fall and dry summer/winter. Precipitation varies considerably, annual values ranging from less than 20 inches to more than 50 inches. It is also continental, characterized by a wide annual temperature range. The climate of Dallas/Fort Worth is humid subtropical with hot summers. The west-to-east oriented floodplain of the Trinity River is a few miles south of the airfield. Lake Grapevine, one of many manmade reservoirs in the area, lies a few miles northwest of DFW Airport. The river is controlled by a network of dams and levees. Numerous tributaries of the Trinity River converge in the area, becoming one waterway departing Dallas for the Gulf of Mexico, which is nearly 300 miles to the southeast. Rolling hills range in elevation from around 500 feet to more than 800 feet. Within the southern reaches of the Great Plains, the region is a mixture of prairie and oak woodlands though much of the natural landscape has been overtaken by urbanization and agricultural land use. The combined urban area has become one of the most populous metropolitan areas in the country. ![]() ![]() The Weather Bureau opened an office in downtown Fort Worth in 1898, from which the continuous Dallas/Fort Worth climate record began. The settlement of Dallas was founded in 1841, and the establishment of the military outpost of Fort Worth followed in 1849. The Dallas/Fort Worth Metroplex is located in North Central Texas.
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