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.
Weather in Jamaica in September. The average maximum daytime temperature in Jamaica in September is a hot 31Â°C (88Â°F) with high heat & humidity. There are usually 7 hours of bright sunshine each day, which represents 54% of the 12 hours of daylight. The average sea temperature in and around Jamaica in September is 29Â°C (84Â°F). Expect 229mm (9.0 inches) of rainfall across the whole of September with 14 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear.