Last updated: August 1, 2025
In Chang'an, China, staying informed about the UV Index is paramount for safeguarding your skin and overall health. With the region's distinct Cwa climate, which features humid summers and mild winters, understanding UV levels can help residents and visitors alike prevent sunburn and reduce the risk of long-term skin damage. During peak hours, especially between 11:00 AM and 1:00 PM, the UV Index can soar to a maximum of 12, indicating a very high level of exposure. By staying vigilant and taking necessary precautions, you can enjoy the sunlight while keeping your skin safe and healthy.
The UV Index throughout the day showcases a stark increase as the sun rises, starting from a mild 1 at 07:00 and peaking at a striking 12 between 12:00 and 13:00. This significant surge highlights the importance of sun protection, especially during the hours when the index reaches maximal levels of 10 at 11:00 and 11 at 14:00. As the afternoon wanes, the UV Index begins to decline, dropping to 8 by 15:00 and finishing the day with a gentle return to 1 by 19:00. This data serves as a crucial reminder to prioritize sun safety during midday hours when UV exposure is at its highest.
| 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 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 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 experiences significant seasonal changes, peaking in the summer months. From January to February, the UV Index begins at 6 and escalates to 7, categorizing the exposure as high, with a burn time of 25 minutes. As spring approaches, March sees an increase to 8 (very high), leading to a decrease in burn time to 15 minutes. The UV Index reaches its maximum intensity from April to September, with values between 11 and 13 (extreme), resulting in a critical burn time of only 10 minutes. The risk notably subsides in October with a drop to 9 (very high) and continues to decline throughout November and December, when the levels are 7 (high) and 5 (moderate) respectively, allowing for 25 and 30 minutes before burn occurs. Visitors and residents are advised to take precautionary measures during the high-risk months (April to September), ensuring adequate sun protection such as sunscreen, hats, and protective clothing to minimize 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 |
| Chang'an | 6 | 7 | 8 | 11 | 12 | 13 | 12 | 12 | 11 | 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 |