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.
Globally, the average land surface temperature was the sixth highest on record for September at 0.89Â°C (1.60Â°F) above the 20 th century average of 12.0Â°C (53.6Â°F). Denmark had its seventh warmest September since records began in 1874, with a temperature 1.9Â°C (3.4Â°F) higher than the 1961â1990 average and 0.8Â°C (1.4Â°F) higher than the most recent 2001â2010 decadal average.