Last updated: August 1, 2025
Understanding the UV Index is crucial for residents and visitors of Delong, China, especially given its Cfa climate, which results in significant sun exposure throughout the year. Being aware of UV levels not only helps you plan your outdoor activities but also plays a vital role in preventing sunburn and protecting your skin health. During peak hours, such as 12 PM when the UV Index reaches a maximum of 12, the risk of harmful effects from sunlight increases dramatically. With Delong's typical sunny days, staying informed about UV intensity can help you enjoy the outdoors safely while minimizing the risk of skin damage.
The UV Index today showcases a dramatic rise in sun exposure as the day progresses. Starting at 7:00 AM with a mild value of 1, the index climbs steadily to reach 4 by 9:00 AM. However, it's around 11:00 AM that the UV radiation peaks at 10, escalating further to a maximum of 12 at noon. The sun’s intensity continues to be fierce, reaching a high of 13 by 1:00 PM before gradually tapering off. From 2:00 PM, the index starts its descent, hovering at 12 and then dropping to 9 by 3:00 PM. As the afternoon transitions into evening, the UV levels diminish significantly, resting at 1 by 7:00 PM. For anyone spending time outdoors, taking precautions during the peak hours is crucial to ensure safety from harmful UV rays.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index demonstrates significant seasonal changes, peaking during the summer months. From January to February, the UV Index ranges from 6 to 7, indicating a high risk of harm from unprotected sun exposure with a burn time of 25 minutes. As spring arrives in March, the index rises to 9 (very high) with a reduced burn time of 15 minutes, escalating to extreme levels (12) in April through June, where the burn time drops to just 10 minutes. July sees the peak UV Index of 13, before slightly declining to 12 in August. As we transition to fall, September and October remain very high with indexes of 10 and 9 respectively and a burn time of 15 minutes. By November, the levels decrease to 7 (high) and 5 (moderate) in December, extending burn times to 25 and 30 minutes. It’s essential for visitors and residents to stay vigilant, particularly from March to October, using sunscreen, seeking shade, and wearing protective clothing during peak UV hours to mitigate the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Beijing UVI | 2 | 3 | 5 | 8 | 9 | 9 | 10 | 9 | 7 | 6 | 4 | 2 |
| Chengdu UVI | 5 | 6 | 8 | 10 | 12 | 11 | 11 | 10 | 11 | 8 | 6 | 4 |
| Shanghai UVI | 5 | 6 | 8 | 10 | 10 | 11 | 12 | 11 | 11 | 8 | 6 | 4 |
| Delong | 6 | 7 | 9 | 12 | 12 | 12 | 13 | 12 | 10 | 9 | 7 | 5 |
| Guangzhou UVI | 7 | 9 | 11 | 12 | 13 | 13 | 13 | 12 | 11 | 10 | 9 | 7 |
| Shenzhen UVI | 7 | 10 | 12 | 12 | 14 | 13 | 13 | 13 | 12 | 11 | 9 | 7 |