Last updated: June 2, 2025
In Lander, Wyoming, awareness of the UV Index is crucial for safeguarding your skin against harmful solar radiation. Understanding daily UV levels is essential not only for sunburn prevention but also for maintaining overall skin health. With Lander’s semi-arid climate (BSk), residents and visitors alike experience significant UV exposure, especially during peak daylight hours when values can soar to an intense 12. Stay informed about the UV Index to protect yourself while enjoying the great outdoors!
As the sun rises, the UV Index begins its ascent, starting at a modest 1 by 7:00 AM. By 9:00 AM, it jumps to 4, signaling that the sun is getting stronger. 10:00 AM witnesses a significant surge to 6, and just after 11:00 AM, the Index soars to its peak at 12. The intensity remains high, hitting 11 again by 2:00 PM, before gradually declining through the afternoon. At 4:00 PM, it drops to 7, and by 6:00 PM, it recedes further to 3, echoing the day's retreat. By the time night falls at 7:00 PM, the UV Index returns to a safe level of 1. Remember to stay protected during those peak hours between 11:00 AM and 2:00 PM!
| 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 | 12 | 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 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index exhibits notable seasonal changes, significantly impacting sun exposure and skin health. High-risk months for UV exposure are typically from April to August, where UV levels reach very high and extreme categories, with an alarming peak of 12 in June and July, resulting in a rapid burn time of just 10 minutes for unprotected skin. In contrast, during the winter months of January, February, November, and December, the UV Index remains lower, within the moderate range of 3 to 5 and offering 30 minutes for burn time. To safeguard against harmful UV rays, it's crucial for both visitors and residents to apply sunscreen, wear protective clothing, and seek shade, particularly during peak summer months. Awareness and proactive measures can help prevent skin damage and promote sun safety year-round.
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 |
| Lander | 3 | 5 | 7 | 10 | 10 | 12 | 12 | 11 | 9 | 6 | 4 | 3 |
| 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 |