Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Hanna, United States, where the climate can expose individuals to varying levels of ultraviolet radiation throughout the day. With typical UV exposure peaking between 10 AM and 2 PM, awareness of UV levels can significantly aid in preventing sunburn and maintaining long-term skin health. As Hanna experiences a Dfb climate, characterized by hot summers and cold winters, being informed about daily UV risks can help locals make better choices for outdoor activities, ensuring they protect their skin while enjoying the beautiful surroundings.
As the sun climbs higher in the sky, the UV Index undergoes a dramatic shift throughout the day. Starting at a modest 1 by 07:00, it quickly gains momentum, reaching 2 by 08:00. By 09:00, it hits 4, but the real surge begins as we approach midday; at 10:00, it spikes to 7, culminating in a peak of 12 from 12:00 to 14:00. This high level of UV radiation calls for caution, especially for outdoor activities. As the afternoon progresses, the index gradually decreases, dipping to 10 at 15:00, before winding down to 4 by 17:00, and finally retreating to 1 by 19:00 as the day comes to a close. Remember to protect your skin during those peak hours!
| 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 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 10 | 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 |