Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Logan, United States, where the semi-arid BSk climate brings unique challenges and opportunities for sun exposure. During peak hours, especially from 11:00 AM to 1:00 PM, UV levels can surge to a vigorous 11, putting skin health at serious risk for sunburn and long-term damage. By staying informed about UV levels, you can take proactive measures to protect yourself and your loved ones, ensuring a safe and enjoyable time outdoors. In Logan, being aware of the UV Index not only safeguards your skin but enhances your overall well-being under the sun.
The UV Index throughout the day follows a dynamic trajectory, peaking during midday hours. Early in the morning, at 7:00 AM, the index is a mere 1, indicating minimal risk. However, as the sun rises, the intensity escalates sharply, reaching 11 by 12:00 PM and 1:00 PM, signaling a high risk period for unprotected skin. By 3:00 PM, there's a noticeable decline to 8, and it continues to fall gently, arriving back at 1 by 7:00 PM. It’s crucial to stay protected during those peak hours, especially between 10:00 AM and 3:00 PM, when the sun's rays are the strongest.
| 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 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index exhibits significant seasonal variations, with high-risk months typically occurring between March and August, where the index reaches very high to extreme levels. Notably, April through August presents the greatest concern, with UV Index values consistently at 11 or 12, resulting in a dangerously quick burn time of just 10 minutes. Even in March and September, the index remains high, at 9 and 10, respectively. During these peak months, it is crucial for visitors and residents to take precautionary measures, such as wearing sunscreen with high SPF, protective clothing, and seeking shade during peak sunlight hours to mitigate the health risks associated with overexposure to UV radiation. In contrast, the winter months of January, November, and December see a significant dip in UV levels, with a moderate exposed category and longer burn times of 30 minutes, allowing for safer outdoor activities.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Logan | 4 | 6 | 9 | 11 | 11 | 12 | 12 | 12 | 10 | 8 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |