Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Glenns Ferry, United States, where the semi-arid climate can lead to significant sun exposure. Being aware of UV levels not only helps in preventing painful sunburns but also plays a vital role in protecting long-term skin health. With peak UV Index values reaching as high as 11 during the hotter months, it’s essential to monitor daily UV readings to enjoy the outdoors safely. Whether you're hiking, gardening, or simply soaking in the sun, an informed approach to UV exposure can help you stay protected while embracing our beautiful Idaho surroundings.
As the sun rises, the UV Index remains relatively low, starting at a gentle 1 from 07:00 to 09:00. However, as the day progresses, the UV levels ramp up significantly, reaching a moderate 5 by 10:00 and hitting a peak of 11 between 13:00 and 14:00. This period signifies the highest risk, urging outdoor enthusiasts to take precautions. By 15:00, the index starts to dip to 10, followed by a gradual decline to 5 at 17:00, and settling at 2 by 19:00. It's a clear reminder that during midday, when the sun is at its strongest, the need for protection is paramount to safeguard against harmful UV radiation. Enjoy the sunshine, but don't forget your sunscreen! ☀️
| 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 | 9 | 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 | 8 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
Throughout the year, UV exposure varies significantly, with high-risk months typically occurring from March to September. During these months, particularly in April through July, the UV index reaches notably high levels, peaking at 11, which indicates extreme exposure risks and a quick burn time of just 10 minutes. As the seasons shift, visitors and residents should be particularly vigilant from May to August, when protective measures such as sunscreen, hats, and seeking shade are essential to prevent skin damage. In contrast, January, November, and December present a moderate UV index of 3-4, allowing for longer burn times of 30 minutes, though sunscreen should still be applied. Staying informed about these UV changes can help ensure safe outdoor activities 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 |
| Glenns Ferry | 3 | 5 | 7 | 9 | 10 | 11 | 11 | 10 | 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 |