Because several different germs can cause encephalitis, spread of the infection may take place in different ways. For example, mosquitoes transmit viruses that cause West Nile encephalitis, St. Louis encephalitis, and western equine encephalitis.ncephaliti s may be caused by a variety of viruses, bacteria, and other organisms. These agents include:. 1  Measles, chicken pox, rubella (German measles), mumps, polio, and other viral illnesses, which generally lead to a mild form of encephalitis known as postinfectious or para-infctious encephalitis.
On average, the warmest days of the year in Seattle occur between July 26 and August 8, with average highs of 76 degrees. These are some of the best days to spend on some of Seattle's beaches. Alki Beach Park is open from 6 a.m. until 11 p.m.
In most years, Seattle averages a daily maximum temperature for December that's between 45 and 49 degrees Fahrenheit (7 to 9 degrees Celsius). The minimum temperature usually falls between 34 and 38 Â°F (1 to 3 Â°C). December is the coldest month overall for Seattle and the 20th and 21st are its chilliest days. They have daily highs averaging 46.2 Â°F (7.9 Â°C) and lows of 35.6 Â°F (2.0 Â°C). Nearly every December day warms to over 40 Â°F (4 Â°C) in Seattle. Temperatures above 60 Â°F (16 Â°C) are not expected here this month.