Last updated: July 2, 2025
Understanding the UV Index is vital for residents of Glen Ullin, United States, as it provides essential information on the intensity of ultraviolet radiation in the area. High UV levels, especially during the midday hours, can lead to sunburn, skin aging, and increase the risk of skin cancer. With Glen Ullin's Dfb climate, characterized by warm summers, it's crucial to stay informed about UV exposure risks. Knowing when to protect your skin helps promote better skin health and ensures you enjoy the beautiful outdoors safely. Be proactive and embrace the sun wisely!
The UV Index data for the day reveals a dynamic and intense sun exposure. Starting off with a maximum of 1 at 7:00 AM and 8:00 AM, it quickly rises to 2 by 9:00 AM. The sun reaches its peak intensity from 12:00 PM to 3:00 PM, hitting a scorching 9 during the hottest hours. As the afternoon wanes, the UV index gradually declines to 7 by 4:00 PM, then further to 5 at 5:00 PM, and eventually settling at a more manageable 2 by 7:00 PM. To stay safe and protect your skin, it's crucial to seek shade and apply sunscreen, especially during those midday hours when the UV Index is at its highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
The UV Index experiences notable seasonal changes, with peak levels occurring in the summer months. April through August are high-risk months, characterized by very high UV exposure (Index 9-10) with a burn time as short as 15 minutes. As temperatures rise, residents and visitors are advised to take precautions: wear sunscreen, protective clothing, and seek shade when outdoors, especially during midday hours. In contrast, the UV Index is low in January and December (Index 2), allowing for longer exposure times of 45 minutes without significant risk. During the transition months of February and March, moderate levels (Index 4-5) highlight the importance of vigilance as burn times decrease to 30 minutes. Ultimately, awareness of these seasonal UV changes is crucial for minimizing health risks while enjoying outdoor activities year-round.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Glen Ullin | 2 | 4 | 5 | 9 | 8 | 10 | 9 | 9 | 7 | 5 | 3 | 2 |
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |