Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Madison, United States, where sunburn and skin health can be significantly impacted by ultraviolet radiation. Awareness of UV levels helps you take the necessary precautions to protect your skin from harmful effects, especially during the peak hours when the index is at its highest—reaching levels of 10 at noon. With Madison's humid continental climate, characterized by warm summers and varied sunlight exposure, it’s essential to stay informed about UV risks throughout the year. Keep your skin safe and healthy by monitoring the UV Index and adapting your outdoor activities accordingly!
As the day unfolds, the UV Index reveals a dynamic pattern that encourages cautious sun exposure. Starting gently at 1 at 07:00, the intensity slowly climbs to a moderate 2 by 08:00. However, the real ascent begins at 09:00, when the index reaches 4. The peak occurs between 12:00 and 13:00, with an impressive 10, indicating a high risk of harm from unprotected sun exposure. Following this peak, the UV levels gradually decline, dipping to 9 at 14:00 and then decreasing further to 3 by 17:00. As evening approaches, the UV Index wanes to 1 by 18:00 and 19:00, emphasizing the importance of smart sun safety, especially during the midday hours when the sun's rays are most potent.
| 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 | 10 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal changes, peaking during the summer months. From January to April, the index rises from a moderate level of 4 to a very high 10, indicating increased risk for skin damage. The high-risk months are March through August, where the UV Index reaches extraordinary heights of 10 and 11, with burn times drastically reducing to as little as 10 minutes. It is crucial for visitors and residents to take protective measures, such as wearing sunscreen, sunglasses, and protective clothing, especially during these peak months when exposure can be extremely harmful. As the year progresses into fall, the UV Index decreases but remains significant through October, making sun safety a year-round consideration.
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 |
| Madison | 4 | 6 | 8 | 10 | 10 | 11 | 11 | 10 | 9 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |