Last updated: May 3, 2025
In Williamson, United States, being aware of the UV Index is crucial for protecting your skin and maintaining overall health. With a climate that can expose residents to varying levels of ultraviolet radiation, understanding UV levels helps prevent sunburns and long-term skin damage. During typical sunny days, especially from 10 AM to 2 PM, UV Index values can soar to 12, indicating a high risk for unprotected skin. Stay informed to enjoy the outdoors safely while minimizing the risks associated with intense sun exposure!
As the sun rises, the UV Index begins its ascent, starting at a mild 1 at 07:00. By 08:00, it increases to a moderate 3, but the real surge comes just before noon. The index peaks at an intense 12 during the midday hours, specifically at 12:00, urging sun protection for those outdoors. Following this high, a gradual decrease occurs, with the values declining to 10 by 14:00, then tapering off to 7 at 15:00. As the day wanes, the UV intensity drops significantly, falling to 1 by 19:00, signifying a much safer period for sun exposure. This hourly UVI cycle illustrates a clear pattern: the importance of seeking shade and wearing sunscreen during the peak hours when the sun’s rays are the strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | 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, UV exposure varies significantly, with the high-risk months being March through August, when the UV Index peaks at 12, indicating extreme exposure levels. Specifically, April, May, and June consistently show this maximum UV Index, resulting in a burn time of only 10 minutes for unprotected skin. As summer transitions to fall, the UV Index gradually decreases, but still poses a very high risk in September and October with indices of 10 and 8, respectively. Residents and visitors should remain vigilant, particularly from March to August, and take protective measures, such as applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of skin damage. In contrast, the winter months of January and December see lower UV exposure, categorized as moderate, with longer burn times of 30 minutes, making sun protection less critical but still advisable.
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 |
| Williamson | 4 | 7 | 9 | 11 | 12 | 12 | 12 | 11 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |