With all things being equal, the best light for photography in the Northern Hemisphere tends to be in winter. Even if we are only looking at the light at the start and end of the day, there's not only better light but also a longer window during which this light exists. This is due to the Sun being lower in the sky during winter. The lower angle of the Sun in winter better illuminates the features of the mountains compared to the summer light. Also, in winter, when snow is present, more light is reflected, reducing the chance of harsh shadows. This also means that if you like someone, you should be careful taking their picture in the middle of a sunny summer afternoon, when the Sun is more likely to cast harsh, dark shadows on their face.
