Is there an extreme day in Mohe River from summer solstice in China?

Mohe County is the county with the highest latitude in China. Due to the high latitude and strong daylight in summer, the Northern Lights often appear in Mohe area. Therefore, people call Mohe County "the city that never sleeps in China" and "the city of aurora". The extreme day of Mohe River occurs from summer to 9 days before and after each year, that is, June 15-25. At this time, the Mohe clear sky in Wan Li is the best season for people to travel and visit. The tourism festival lasts for a week and reaches its climax from summer to Sunday. In the evening, people hold bonfire parties to celebrate. During the tourism festival, Chinese and foreign tourists can enjoy sightseeing in the pristine and pollution-free Daxinganling forest region.