Last updated: July 2, 2025
In Jena, United States, understanding the UV Index is crucial for safeguarding your skin and ensuring long-term health. With peak levels reaching as high as 12 during midday hours, the potential for sunburn increases significantly, making awareness essential for effective sunburn prevention. Recognizing the UV levels not only helps you enjoy the outdoors safely but also promotes healthier skin overall. Jena's Cfa climate brings warm summers that can intensify UV exposure risks, prompting everyone to stay informed and take protective measures throughout the day. Whether you're planning outdoor activities or just spending time in the sun, keeping an eye on the UV Index will empower you to protect yourself and your loved ones from harmful effects.
As the sun rises, the UV Index gradually escalates, starting from a gentle 1 at 7:00 AM. By 9:00 AM, it reaches a moderate 3, hinting at the day's potential. The intensity peaks at 12:00 PM, where the index soars to a striking 11, indicating high risk for harm from unprotected sun exposure. Though it dips slightly to 9 by 3:00 PM, the UV levels remain significant. As the afternoon fades, the index gradually decreases to 2 by 6:00 PM, and finally settles back to a mild 1 as day turns to dusk at 7:00 PM. It’s crucial to stay vigilant—during peak hours, particularly between 11:00 AM and 1:00 PM, appropriate sun protection is essential to safeguard against harmful UV radiation.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, peaking during the summer months. High-risk months for sun exposure are from March to August, where values reach extreme levels of 11 to 12, necessitating a burn time as low as 10 minutes. Visitors and residents should exercise caution, especially in these months, ensuring they apply sunscreen frequently, seek shade, and wear protective clothing. As the seasons transition, September and October still show elevated levels at 10 and 8, respectively, marking them as considerable months for UV exposure. It’s advised to remain vigilant even in the cooler months; while January and December pose a lower risk with UV Index levels of 5 and 4, adopting sun safety practices year-round is crucial for skin protection.
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 |
| Jena | 5 | 7 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |