UV index and sunburn time in China
Peak UV index and how quickly unprotected skin burns, for 11 cities in China.
| City | Peak UV | Category | Month | Burns after |
|---|---|---|---|---|
| Shanghai | 11.5 | Extreme | July | 20 min |
| Beijing | 9.4 | Very high | July | 25 min |
| Shenzhen | 13.9 | Extreme | July | 17 min |
| Guangzhou | 13.8 | Extreme | July | 17 min |
| Chengdu | 12.3 | Extreme | July | 19 min |
| Tianjin | 9.6 | Very high | July | 24 min |
| Wuhan | 11.9 | Extreme | July | 20 min |
| Dongguan | 13.8 | Extreme | July | 17 min |
| Daxing’anling | 6.4 | High | July | 36 min |
| Heihe | 6.8 | High | July | 34 min |
| Jiagedaqi | 6.8 | High | July | 34 min |
The same UV also drives vitamin D synthesis — and stops entirely for part of the year at higher latitudes. Vitamin D winters in China →
Burn times are for skin type III with no sunscreen. How these are calculated