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.
The average sea surface temperature in March 2017 for San Diego was 61.5Â°F. The maximum and minimum values were 59.4Â°F and 62.8Â°F respectively. Most of the days in March are sunny but you can also expect cloudy and gloomy days.