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.
Nearly every day in September heats up to over 80 Â°F (26 Â°C) in Las Vegas. The city averages 6 days this month when the thermometer reaches into the 100s Â°F (over 37 Â°C). At night, the thermometer dips to 60 Â°F (16 Â°C) or below on 2 days. Only about once a decade does September get as cold as 50 Â°F (10 Â°C). Most years, Las Vegas gets less than 0.4 inches (9 mm) of rain in September.