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.
Key weather averages for San Diego in March. 1  19. 19Â°C max day temperature. 2  9. 9 hours of sunshine per day. 3  6. 6 days with some rainfall. 4  10. 10Â°C min night temperature. 5  12. 12 hours of daylight per day. 6  0. No heat & humidity. 7  51. 51 mm of monthly rainfall. 8  6. 6 (High) UV index. 9  15. 15Â°C sea temperature.