Last updated: July 2, 2025
Understanding the UV Index in Lyons, United States, is crucial for protecting your skin and overall health. With Colorado's sunny climate, UV levels can soar, peaking between 11 AM and 2 PM where they can reach dangerously high levels of 11. Awareness of these levels can help residents and visitors alike prevent sunburns and long-term skin damage, ensuring safe outdoor enjoyment. As you navigate the beautiful outdoors of Lyons, staying informed about the UV Index will empower you to make informed decisions about sun protection, keeping your skin happy and healthy all year round.
At 07:00, the UV Index is a gentle 1, signaling a low level of UV radiation. As the sun climbs, it gradually rises, reaching a moderate 3 by 09:00. The intensity peaks spectacularly at 12:00 with a powerful 10, indicating a high risk of harm from unprotected sun exposure. For those brave enough to venture out, it's crucial to take precautions, especially between 13:00 and 14:00, when it hits its zenith at 11. The afternoon sees a slow decline, tapering down to 5 by 17:00 and further reducing to a mild 2 as evening approaches at 18:00. Finally, the day concludes with the UV Index dropping back to a safe 1 by 19:00, making for a relaxing end to a sun-soaked day.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 11 | 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 |
The UV Index exhibits significant seasonal variation, peaking during the summer months. From January (UV Index 4) to February (UV Index 7), exposure remains moderate to high, with burn times shortening as spring approaches. The months of March and April see a sharp increase in UV levels (9 and 10 respectively), indicating very high risk for sunburn, with a burn time of just 15 minutes. The extreme category dominates from May to August (UV Index 11), where even brief sun exposure can result in burns within 10 minutes. As we move into September and October, the index drops to 10 and 8, maintaining a very high risk, before returning to a moderate level in November and December (UV Index 6 and 4). Visitors and residents are strongly advised to take precautions, especially from March through October, by wearing protective clothing, using sunscreen, and seeking shade during peak sun hours to minimize the risk of skin damage.
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 |
| Lyons | 4 | 7 | 9 | 10 | 11 | 11 | 11 | 11 | 10 | 8 | 6 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |