Amarillo has an average summer temperature of 76.5 degrees. The answer lies in the Panhandle, particularly around and north of Amarillo. According to previous data, Houston has the best climate of the six major cities in Texas (Houston, San Antonio, Dallas, Fort Worth, Austin and El Paso). The worst part of Houston's weather is summer.
They can be long, hot and abrasive. There isn't much relief in summer and temperatures tend to exceed 100 degrees. The University of Texas School of Public Health is conducting the first comprehensive study on heat islands in the city of Houston, Texas. However, Texas is very hot and often quite arid; in some parts of the state it rains, it's cold and even snows in winter (Texas View).