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.
As a broad general rule, the closer you get to the coast, the less sunshine and warmth you can expect. Southern Oregon is generally sunnier than northern Oregon. The southeast, near the Nevada border, has the sunniest weather and the warmest summers. The sunniest areas in Oregon are also the coldest in winter.Proximity to the ocean increases temperature mildness, but also increases cloud cover.A lot of people are looking for a mix of good summer weather and mild winter weather.he sunniest areas in Oregon are also the coldest in winter. Proximity to the ocean increases temperature mildness, but also increases cloud cover. A lot of people are looking for a mix of good summer weather and mild winter weather.