Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Hanna, United States, as it serves as a vital tool for safeguarding skin health and preventing sunburn. With the region's Dfb climate bringing varied weather patterns, awareness of UV levels can make a significant difference in your daily outdoor activities. The UV Index in Hanna peaks at 12 around noon, indicating a high risk of harm from unprotected sun exposure. Staying informed about these fluctuations can help you enjoy the beautiful days while protecting your skin from potential damage. So, whether you're soaking up the sun or planning a family outing, knowing the UV Index is essential for your health and safety.
The UV Index throughout the day presents a fascinating pattern as the sun ascends. At 07:00, the index starts at a gentle 1, indicating minimal risk. However, by 09:00, it climbs to 4, marking the arrival of noticeable sunlight. The real intensity hits its peak at 12:00, soaring to an impressive 11—a cautionary moment for those outdoors. As we move through the afternoon, the index remains elevated, reaching 12 at 13:00 before gradually descending, settling back to 7 by 16:00. The evening sees a return to safer levels with 2 at 18:00 and finally back to 1 as the day wanes at 19:00. This dynamic shift underscores the importance of sun protection during peak hours, particularly from 10:00 to 14:00.
| 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 | 7 | 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 | 9 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index exhibits significant seasonal changes, highlighting specific months when sun exposure poses higher risks. March to September stand out as the high-risk months, particularly April through July, which maintain an extreme exposure category with a UV Index reaching 12. During these peak months, burn times can be as brief as 10 minutes, emphasizing the need for heightened caution. As a rule of thumb, visitors and residents should protect their skin by seeking shade, wearing protective clothing, and applying sunscreen generously, especially during the most intense hours of sun exposure between 10 AM and 4 PM. In the winter months (December to February), the UV Index drops to more moderate levels, but it's still advisable to stay vigilant, particularly in February when the index rises to 6. Always check the UV Index before outdoor activities to ensure 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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Hanna | 4 | 6 | 9 | 12 | 11 | 12 | 12 | 11 | 10 | 6 | 5 | 3 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |