Last updated: June 2, 2025
Awareness of the UV Index is crucial for residents and visitors of Lake Arrowhead, where the beautiful scenery can often lead to increased sun exposure. Understanding UV levels not only helps in preventing painful sunburns but is also vital for long-term skin health. With a Dfb climate characterized by sunny summers and varying UV exposure risks, knowing when the UV Index peaks—such as its maximum of 10 between noon and 1 PM—can make a significant difference in your sun safety practices. Stay informed and enjoy Lake Arrowhead’s stunning outdoors safely!
As the sun rises, the UV Index starts at a gentle 1 at 07:00, indicating minimal risk. By 08:00, it increases to 3, prompting a bit more awareness. The intensity builds, reaching 4 by 09:00 and then surging to 7 at 10:00. The day reaches its peak between 12:00 and 13:00, where the UV Index hits its maximum of 10, signaling a high risk for sun exposure. As the afternoon unfolds, the index begins to decline—9 at 14:00, 7 at 15:00, and then easing to 5 by 16:00. The late hours bring a gradual reduction, settling back down to 3 at 17:00, 2 at 18:00, and finally returning to 1 by 19:00. Remember to prioritize sun protection during peak hours, particularly between 11:00 and 13:00, when the risk is at its highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 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 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences noticeable fluctuations, impacting the risk of skin damage due to sun exposure. High-risk months are primarily from April to August, where the UV Index reaches very high levels of 8 to 10, necessitating caution with a significantly reduced burn time of just 15 minutes. In contrast, the UV levels are much lower from January to March and again from November to December, characterized by low to moderate exposure with burn times extending up to 45 minutes. Residents and visitors should be particularly mindful during the peak summer months, ensuring adequate sun protection such as sunscreen, hats, and clothing, and seeking shade during the day to minimize the risk of skin damage. Remember, smarter sun habits can help you enjoy the outdoors safely!
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lake Arrowhead | 2 | 4 | 5 | 8 | 9 | 10 | 9 | 9 | 7 | 5 | 3 | 2 |
| 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 |