Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Yanji, China. With its subtropical highland climate, Yanji experiences significant sunlight exposure, particularly during the summer months. Monitoring the UV levels can help prevent sunburn and protect skin health, reducing the risk of long-term damage. Notably, the highest UV Index values can reach 10 around midday, signaling a need for protective measures. Being aware of these levels empowers individuals to enjoy the outdoors safely while minimizing harmful effects from the sun's rays.
The UV Index throughout the day showcases a dynamic rise and fall, painting a vivid picture of sun exposure risk. Starting at a low 1 at 07:00, the index climbs steadily, reaching 3 by 08:00 and accelerating to 5 at 09:00. The peak occurs at 12:00, hitting a high of 10, signifying a critical time for sun safety. Post-noon, the UV intensity begins to wane, dropping to 9 at 13:00, then gradually declining to 6 by 15:00. As the day winds down, the levels fall further to 2 by 17:00, and finally ease back to 1 at both 18:00 and 19:00. This clear shift emphasizes the importance of sun protection during those high UV hours, particularly between 11:00 and 13:00.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index shows distinct seasonal changes that are important for both visitors and residents to consider. From January to February, the UV Index ranges from 4 to 5, categorized as moderate, with a burn time of 30 minutes. As spring approaches in March, the index rises to 7 (high), reducing burn time to 25 minutes. The summer months of April through August see significantly higher levels, peaking at 11 in August (extreme category) with a burn time of just 10 minutes, marking these as high-risk months for sun exposure. As fall arrives in September and October, the index decreases to 8, still indicating very high risk. By late fall and winter, November and December return to a moderate risk with indices of 5 and 3 respectively, allowing for longer burn times of 30 minutes. Visitors and residents are advised to take necessary precautions during high UV months, especially from April to August, by seeking shade, wearing protective clothing, and applying sunscreen to minimize the risk of sunburn and long-term 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 |
| Yanji | 4 | 5 | 7 | 8 | 10 | 10 | 10 | 11 | 8 | 8 | 5 | 3 |
| 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 |
| 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 |