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.
Average high temperatures for major US cities during September range from 70 degrees Fahrenheit (21 degrees Celsius) in San Francisco to 100 F (38 C) in Phoenix.emperatures this month are especially comfortable in cities such as New York and Philadelphia where the days are usually around 75 F (24 C) and the nights average about 60 F (16 C). National Climatic Data Center.