Bradycardia can be caused by: 1  Changes in the heart that are the result of aging.  Diseases that damage the heart's electrical system. These include coronary artery disease, heart attack, and infections such as endocarditis and myocarditis.
Portland Weather In May. The highest recorded temperature in May for Portland for the past 70 years was 100 degrees Fahrenheit, most recently measured on May 28, 1983, and the normal high is 67.
Southwest Oregon is known for its mild climate. Average annual maximum temperature is 68.0, the summer months can get very hot. Annual minimum 40.9. Average annual precipitation is 29.5 inches. Snowfall is minimal - 2.3 inches per year in lower regions and in many years is non-existent. In higher mountain regions it is more.