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 bluish-white or even blue (shorter wavelengths).
Average Weather in September in Sheridan Wyoming, United States. In Sheridan, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 14Â°F, from 82Â°F to 69Â°F over the course of the month, and rarely exceeding 93Â°F or dropping below 53Â°F.
Over the course of the year, the temperature in West Yellowstone typically varies from 7Â°F to 77Â°F and is rarely below -10Â°F or above 84Â°F. The warm season lasts for 89 days, from June 17 to September 14, with an average daily high temperature above 66Â°F.