All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. $('#myfcst').remove(); Average daytime summer temperatures range from approximately 55 to 78F (12.8 to 25.6C); average daytime winter temperatures are about 5 to 30F (15.0 to 1.1C).