Last updated: July 2, 2025
Understanding the UV Index is crucial for the residents of Ulaanjirem, Mongolia, where the arid BWk climate brings about intense sunlight, particularly during the summer months. With peak UV levels soaring to a critical 10 around midday, awareness of these levels is essential for preventing sunburn and preserving skin health. By keeping an eye on the UV Index, you can take necessary precautions to protect yourself and your loved ones from harmful radiation while enjoying the outdoors in this vibrant region. Don't let the sun catch you off guard—be informed and stay safe!
As the sun climbs higher in the sky, the UV Index rises dramatically throughout the morning and into the afternoon. Starting at a modest 1 at 7:00 AM, the levels gradually escalate, reaching 2 by 8:00 AM and hitting 4 by 9:00 AM. The intensity peaks at 10 around 1:00 PM, marking the most critical time for sun safety. From this peak, the index gently descends, dropping to 9 at 2:00 PM and then tapering down to 3 by 5:00 PM. As evening approaches, the UV Index diminishes to a gentle 1 by 7:00 PM. It's essential to stay protected during the mid-day heat, especially when the UV levels are at their 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 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal changes throughout the year, peaking during the summer months. January and December record the lowest UV levels (Index 2), classified as low exposure, allowing for a burn time of 45 minutes. As spring approaches, February and March see a rise in UV levels to 3 and 5, indicating moderate exposure and shorter burn times of 30 minutes. The highest UV Index occurs from April to August, reaching 10 during the summer, which is categorized as very high, meaning individuals can burn in as little as 15 minutes under direct sunlight. As fall arrives, September and October show a decrease to 7 and 5, indicating high to moderate levels of risk respectively, with burn times extending back to 25 and 30 minutes. Visitors and residents are advised to take protective measures, especially from April through August, when the risk of UV-related harm is at its peak; wearing sunscreen, hats, and UV-protective clothing, and seeking shade is essential during these high-risk months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Darhan UVI | 1 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Erdenet UVI | 2 | 3 | 5 | 7 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Ulan Bator UVI | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 9 | 6 | 4 | 3 | 1 |
| OElgii UVI | 2 | 3 | 5 | 7 | 10 | 9 | 9 | 9 | 7 | 5 | 2 | 1 |
| Khovd UVI | 2 | 3 | 6 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 1 |
| Ulaanjirem | 2 | 3 | 5 | 8 | 10 | 10 | 10 | 10 | 7 | 5 | 3 | 2 |