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.
Portland, Oregon has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (62%), croplands (23%), built-up areas (11%), and lakes and rivers (4%).he hottest day of the year is July 29, with an average high of 82AÂ°82Ã¢ f and low OFÂ°55a. 55Ã¢ f the cold season Lasts from november 14 to february 23 with an average daily high TEMPERATUREÂ°Below. 51a 51Ã¢ f the coldest day of The year, is december 27 with an AVERAGEÂ°Low of 33a 33Ã¢ FÂ°And. high of 44a 44Ã¢ f