Last updated: June 2, 2025
Understanding the UV Index is vital for residents of Boyden, United States, where the climate is classified as Dfa—characterized by hot summers and significant solar exposure. Being aware of the UV levels helps prevent sunburn and protects skin health, especially during peak hours when the index can reach a staggering 11 at noon. As summer days grow warmer, knowing how to monitor UV risk becomes essential to safeguard yourself and your loved ones from harmful rays. So, whether you're heading outdoors for leisure or work, keeping an eye on the UV Index will empower you to enjoy the sunshine safely.
The UV Index throughout the day exhibits a clear and striking progression. Starting off at a gentle 1 at 07:00, the intensity gradually climbs as the sun rises. By 09:00, it reaches 3, but the real surge hits at 10:00, peaking at an impressive 11 around 13:00—a crucial time for sun safety. The index begins to taper off after this zenith, with values declining to 5 by 17:00 and dipping further to 1 as the day winds down at 19:00. This data highlights the importance of taking protective measures during the midday hours when UV exposure is at its highest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 9 | 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 |
The UV Index exhibits significant seasonal fluctuations, with high-risk months generally occurring from April through September. During these months, the UV Index peaks, reaching an extreme level of 11 in June, where exposure should be limited to just 10 minutes to avoid sunburn. The remainder of the summer, particularly in July and August, also presents very high levels, suggesting burn times of only 15 minutes. Conversely, the winter months, particularly January and December, feature lower indices of 2 and 3, respectively, meaning sun exposure is less hazardous, allowing for burns in approximately 45 minutes. Residents and visitors are strongly advised to take necessary precautions during higher UV Index months, including wearing sunscreen, protective clothing, and seeking shade, especially between 11 a.m. and 3 p.m., when the sun is at its most intense. As the seasons change, adjusting sun safety practices is essential for safeguarding skin health.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boyden | 2 | 5 | 5 | 8 | 9 | 11 | 10 | 9 | 8 | 5 | 3 | 3 |
| 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 |