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.
Shetland Islands: Weather Forecast. The warmest day over the next 7 days in Shetland Islands is forecast to be 19th April at 10Â°C (50Â°F) and the warmest night on 19th April at 7Â°C (45Â°F). The average temperature over the next 7 days is forecast to be 8Â°C (46Â°F) and there will be 1 day of sunshine .