Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Window Rock, United States. With a BSk climate characterized by sunny days, awareness of UV levels is essential for preventing sunburn and maintaining skin health. On peak days, the UV Index can soar to a high of 13 around midday, emphasizing the need for protective measures during outdoor activities. By keeping an eye on the UV Index, you can enjoy the sun safely while safeguarding your skin against harmful rays and long-term damage.
Experience the dynamic rise and fall of the UV Index throughout the day, peaking at 1 PM with a striking 13—the highest level of the day. As the sun climbs higher, the index escalates from a gentle 1 at 7 AM to a brilliant 11 by noon, urging outdoor enthusiasts to take precautions. By 11 AM, a 9 signals moderate risk, prompting sun safety awareness. The decline starts after 2 PM, dropping to 7 by 4 PM and sinking back to 1 by 7 PM as twilight approaches. This hourly pattern highlights the importance of sun protection during the midday hours, especially when the UV index peaks!
| 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 | 6 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV Index levels fluctuate, indicating varying risks for skin exposure. The high-risk months are primarily from March to September, where the UV Index peaks at 13 in both June and July, classified as extreme, resulting in a burn time of only 10 minutes. Visitors and residents should prioritize skin protection during these months with appropriate sunscreen, protective clothing, and seeking shade during peak hours. The months of February and October also present very high UV levels of 8, with shorter burn times of 15 minutes, necessitating caution. Conversely, January, November, and December feature moderate to high UV levels, with more forgiving burn times, though protective measures should still be considered. Emphasizing sun safety year-round is essential for both health and well-being.
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 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |
| Window Rock | 5 | 8 | 9 | 11 | 12 | 13 | 13 | 12 | 11 | 8 | 6 | 4 |