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 California coast has what is called a maritime climate. In other words, its climate is influenced by oceanic air patterns. Maritime climates tend to have cool summers, warm winters and a minimal change in temperature throughout the year. San Diego, famous for its year-round beautiful weather, has a high of 65 degrees Fahrenheit in January and a high of 75 degrees in July. That's a change of only ten degrees from January to July.