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.
This is not entirely true. The temperature in the nights are around 5-10 CÂ° in August in the lowland, but it is colder if you are in the Highlands. It is very rare to see snowline in August, in recent year it hasn't simply been like that. Last september the temperature in Akureyri reach over 15 CÂ° on 10 days. Iceland enjoys quite similar climate as Northern Scotland, except it is more sun usually, and usually less humid.