Atenolol and chlorthalidone combination is used to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly.
San Marcos Average Weather. 1  The highest monthly average temperature in San Marcos for August is 70 degrees. 2  The lowest monthly average temperature in San Marcos for January is 55 degrees. 3  The most monthly precipitation in San Marcos occurs in January with 2.3 inches.  The air quality index in San Marcos is 22% worse than the national average.
San Marcos, CA Population and Races. As of 2010-2014, the total population of San Marcos is 87,808, which is 59.72% more than it was in 2000. The population growth rate is much higher than the state average rate of 12.39% and is much higher than the national average rate of 11.61%.