Last updated: July 2, 2025
Awareness of the UV Index is crucial for residents and staff at Grand Forks Air Force Base in the United States, where the Dfb climate can lead to varying levels of sun exposure throughout the day. Understanding UV levels is essential for preventing sunburn and protecting skin health, especially as the index reaches a peak of 9 from 1 PM to 3 PM—indicating a high risk of harm from unprotected sun exposure. By familiarizing yourself with these UV Index readings, you can take proactive steps to safeguard your skin while enjoying the outdoors in this vibrant base among the northern plains.
As the sun rises, the UV Index gradually climbs, starting at a low of 1 by 07:00 and 08:00. The real leap begins at 09:00, where it reaches 3, escalating to 4 by 10:00. As noon approaches, the UV Index peaks at an impressive 9 from 13:00 to 14:00, making it crucial to take protective measures during those hours. Afterward, it begins to taper off, dropping to 6 by 16:00, and further declining through the late afternoon and evening, eventually falling back to 1 by 19:00. For those venturing outdoors, staying vigilant to the UV levels during the midday hours is essential for skin protection!
| 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 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences notable fluctuations, impacting sun safety practices for both residents and visitors. From January to March, the UV levels are relatively low to moderate, with burn times ranging from 30 to 45 minutes. However, April marks the beginning of higher UV exposure, reaching a peak in May and June, where the index hits 9, classified as very high, and the burn time drops to just 15 minutes. July and August maintain these critical levels, posing significant risk for unprotected skin. September sees a decrease to a high index of 7, while October and November present moderate conditions again, allowing burn times of 30 minutes. By December, UV exposure returns to low levels. Visitors and residents are strongly advised to prioritize sun protection during the high-risk months of May through August, by applying sunscreen, seeking shade, and wearing protective clothing to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grand Forks Air Force Base | 2 | 4 | 5 | 7 | 8 | 9 | 9 | 8 | 7 | 4 | 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 |