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Austin is located on the Colorado River where the river crosses the Balcones Escarpment, separating the Texas Hill Country from the blackland prairies to the east. Elevations within the city vary from 400 to 1,000 feet above sea level. Native trees include cedar, oak, walnut, mesquite and pecan. The climate of Austin is humid subtropical. Summers are hot and seem to last from May through October. Winters are mild, with below-freezing temperatures occurring on no more than 25 days each year. Rather strong northerly winds, accompanied by sharp drops in temperature, occasionally may be felt during the winter months in connection with cold fronts, but cold spells are usually of short, most last only a couple of days. Daytime temperatures in summer are hot, but summer nights are usually pleasant with average daily minimums in the lower 70s. Precipitation is fairly evenly distributed throughout the year, with heaviest amounts occurring in late spring and a total annual average of 32.5 inches. A second rainfall peak occurs in September. Rainfall from April through September usually results from thundershowers, with fairly large amounts falling within short periods of time. Some areas are prone to flash flooding. While thunderstorms and heavy rains may roll in during all months of the year, most of the winter precipitation occurs as light rain. Snow is insignificant as a source of moisture. It usually melts as rapidly as it falls. On the rare occasion that snow falls or rain freezes, Austin pretty much shuts down. Prevailing winds are southerly throughout the year. Northerly winds accompanying the colder air masses in winter soon shift to southerly as these air masses move over the Gulf of Mexico. Destructive winds and damaging hailstorms are infrequent. On rare occasions, dissipating tropical storms affect the city with strong winds and heavy rains.
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