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 Diego: Annual Weather Averages. August is the hottest month in San Diego with an average temperature of 23Â°C (73Â°F) and the coldest is January at 14Â°C (57Â°F) with the most daily sunshine hours at 10 in July. The wettest month is February with an average of 53mm of rain.