In 2023, the city’s annual average sunshine duration was 1,518.9 hours, 83.8 hours more than the long-term average but 151.3 hours fewer than the previous year. Across counties (cities, districts), sunshine hours ranged from 1,426.8 hours (Hengyang urban area) to 1,658.4 hours (Hengshan), with anomalies ranging from -56.6 hours (Hengyang urban area) to +238.2 hours (Hengshan). Nanyue Mountain recorded 1,344.2 hours of sunshine, 108.9 hours below its long-term average.