Last updated: August 1, 2025
Understanding the UV Index is crucial for residents of Walden, United States, especially given its Dfc climate, which can bring significant sun exposure during warmer months. Being aware of UV levels helps in preventing sunburns and safeguarding skin health, essential for enjoying outdoor activities without the harmful effects of overexposure. With UV Index values peaking at 12 during midday, it’s vital to stay informed and protected to minimize risks associated with skin damage and long-term health issues. Embrace the sunshine safely by keeping an eye on the UV Index and taking necessary precautions!
As the sun climbs higher in the sky, the UV Index undergoes a dramatic shift throughout the day. Starting at a modest 1 by 07:00, it quickly gains momentum, reaching 2 by 08:00. By 09:00, it hits 4, but the real surge begins as we approach midday; at 10:00, it spikes to 7, culminating in a peak of 12 from 12:00 to 14:00. This high level of UV radiation calls for caution, especially for outdoor activities. As the afternoon progresses, the index gradually decreases, dipping to 10 at 15:00, before winding down to 4 by 17:00, and finally retreating to 1 by 19:00 as the day comes to a close. Remember to protect your skin during those peak hours!
| 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 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | 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 |
As the seasons change, so do the UV index levels, significantly affecting sun exposure and burn risk. From March to August, the UV index reaches its peak, with April, May, and June classified as very high to extreme (UV Index 12-13), leading to a burn time of just 10 minutes. March also sees a high index of 9, indicating very high exposure risks. July and August follow closely with slightly decreased, yet still extreme levels at 12 and 11, respectively. Visitors and residents are advised to take extra precautions during these high-risk months, including seeking shade, wearing protective clothing, and using broad-spectrum sunscreen, as the risk of skin damage increases substantially. In contrast, during the winter months of December and January, the UV index lowers to moderate levels (3-4), allowing for longer exposure times of 30 minutes without immediate burn risk. Overall, awareness of the seasonal UV changes is crucial for protecting skin health throughout the year.
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 |
| Walden | 4 | 6 | 9 | 12 | 12 | 13 | 12 | 11 | 10 | 7 | 5 | 3 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |