The coolest stars are the red dwarfs/red giants, with surface temperatures of 3,500 Kelvin or less. As the surface temperature gets hotter, the color of the star turns orange, and then yellow-orange, and then yellow, yellow-white, and then around 5,800 Kelvin it appears white.
In most years, Seattle averages a daily maximum temperature for September that's between 69 and 73 degrees Fahrenheit (20 to 23 degrees Celsius). The minimum temperature usually falls between 52 and 55 Â°F (11 to 13 Â°C). The days at Seattle begin to cool down quickly during September.
40 Â°F min. or less (4 Â°C). Usually every day in March the temperature rises to over 40 Â°F (4 Â°C) in Seattle. The city averages 6 days this month when the thermometer reaches into the 60s Â°F (over 16 Â°C). Temperatures above 70 Â°F (21 Â°C) are unusual during March. The thermometer dips to freezing on an average of 2 nights.