The Simple Answer :   The color of a star's visible light indicates its surface temperature: a relatively cool star glows red (longer wavelength), and very hot ones glow â¦ bluish-white or even blue (shorter wavelengths).
Over the course of the year, the temperature in Shetland typically varies from 37Â°F to 59Â°F and is rarely below 30Â°F or above 63Â°F. The warm season lasts for 82 days, from June 24 to September 14, with an average daily high temperature above 55Â°F. The hottest day of the year is August 6, with an average high of 59Â°F and low of 52Â°F. The cool season lasts for 133 days, from November 26 to April 8, with an average daily high temperature below 46Â°F.
Average High and Low Temperature in September in Edmonton10Â°F20Â°F30Â°F40Â°F50Â°F60Â°F70Â°F80Â°F18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030AugOctSep 169Â°FSep 169Â°F48Â°F48Â°FSep 3059Â°FSep 3059Â°F39Â°F39Â°FSep 1166Â°FSep 1166Â°F45Â°F45Â°FSep 2162Â°FSep 2162Â°F42Â°F42Â°F.